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NCERT Exemplar Solutions Class 10 Science Chapter 3 – Free PDF Download

NCERT Exemplar for Class 10 Science Chapter 3 Metals and Non-metals is available here totally free down load. These answers will allow students to expand a clean expertise of vital topics and questions. Students also can go through the answers provided, and once they get acquainted with the NCERT Exemplar, they may be able to have a look at productively or even perform properly inside the checks. NCERT Exemplar Class 10 Science Chapter three available here in PDF for easy get right of entry to and down load.

Chemistry students already recognise that factors are classified as metals and non-metals. In Class 10 Science textbook, they’ll explore the subject matter in more detail in Chapter three. They will study the choices bodily in addition to the chemical residences of metals and non-metals, extraction strategies, the principle differences among the 2, understand and classify chemical reactions or modifications.

1. Which of the following property is generally no longer shown via metals?

(b) Sonorous in nature

Answer is (c) Dullness

2. The potential of metals to be drawn into thin wires is known as

The solution is (a) ductility

3. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are chargeable for the choices equal?

(i) Good thermal conductivity

(ii) Good electric conductivity

(iv) High melting factor

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (i) and (iv)

The solution is (d) (i) and (iv)

Ductility and electric conductivity have no relation to cooking hence thermal conductivity, and high melting factor are the proper answers.

four. Which one of the following metals does not react with cold in addition to hot water?

The solution is (d) Fe

Sodium and Calcium react vigorously with water and Magnesium reacts with hot water to shape Magnesium Oxide. Iron does not react with bloodless and warm water, however it reacts with steam.

five. Which of the following oxide(s) of iron could be received on the choices extended reaction of iron with steam?

(d) Fe2O3 and Fe3O4

The answer is (c) Fe3O4

3Fe+4H2O →Fe3O4+4H2

6. What happens when calcium is handled with water?

(i) It does not react with water

(ii) It reacts violently with water

(iii) It reacts less violently with water

(iv) Bubbles of hydrogen gasoline fashioned stick with the surface of calcium

(a) (i) and (iv)

(b) (ii) and (iii)

(c) (i) and (ii)

(d) (iii) and (iv)

The solution is (d) (iii) and (iv)

Calcium reacts vigorously with water and paperwork hydrogen, with the intention to make calcium to float.

7. Generally, metals react with acids to present salt and hydrogen fuel. Which of the following acids does not provide hydrogen gasoline on reacting with metals (except Mn and Mg)?

(d) All of those

Answer is (c) HNO3

Nitric acid is a effective oxidizing agent. It reacts with the metallic to form water.

eight. The composition of aqua-regia is

(a) Dil.HCl: Conc. HNO3 3: 1

(b) Conc.HCl: Dil. HNO3 3 : 1

(c) Conc.HCl: Conc.HNO3 3 : 1

(d) Dil.HCl: Dil.HNO3 3: 1

The answer is (c) Conc.HCl: Conc.HNO3 3: 1

9. Which of the subsequent aren’t ionic compounds?

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iii)

The solution is (b) (ii) and (iii)

HCl and CCl4 are covalent compounds; for this reason they can’t be ionic.

10. Which one of the following properties isn’t usually exhibited by way of ionic compounds?

(a) Solubility in water

(b) Electrical conductivity in stable-country

(c) High melting and boiling points

(d) Electrical conductivity in a molten nation

The solution is (b) Electrical conductivity in solid-country

In an ionic compound, unfastened ions aren’t available in stable-state subsequently stable ionic compounds cannot conduct electricity.

eleven. Which of the subsequent metals exist of their local kingdom in nature?

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (ii) and (iv)

(d) (iii) and (iv)

The answer is (c) (ii) and (iv)

Gold and silver are non-reactive metals because of they may be non-reactive they exist inside the native state in nature.

12. Metals are subtle by using using one-of-a-kind methods. Which of the subsequent metals are subtle by electrolytic refining?

(a) (i) and (ii)

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (iii) and (iv)

The answer is (d) (iii) and (iv)

Sodium and potassium are at the choices top in reactivity collection hence they may be subtle through electrolytic refining.

thirteen. Silver articles turn out to be black on extended exposure to air. This is due to the formation of

(d) Ag2S and Ag3N

Answer is (c) Ag2S

Silver metallic reacts with sulphur present inside the ecosystem to form Ag2S. Ag2S is responsible for black colouration of silver articles.

14. Galvanisation is a technique of protecting iron from rusting with the aid of coating with a skinny layer of

The solution is(c) Zinc

Galvanization is a system of applying a layer of Zinc on iron by means of the use of electrolysis.

15. Stainless metallic is a completely beneficial material for our lifestyles. In stainless steel, iron is blended with

(a) Ni and Cr

(b) Cu and Cr

(c) Ni and Cu

(d) Cu and Au

The solution is (a) Ni and Cr

Stainless metallic is an alloy of Iron, Nicker and chromium. This alloy makes the steel strong, durable and corrosion-resistant.

16. If copper is stored open within the air, it slowly loses its shining brown surface and profits a inexperienced coating. It is due to the formation of

The answer is (d) CuO

On exposure to air, copper reacts to atmospheric oxygen to shape copper oxide layer that’s inexperienced in shade.

17. Generally, metals are stable in nature. Which one of the following metals is determined in liquid state at room temperature?

The solution is (d) Hg

18. Which of the following metals are obtained with the aid of electrolysis of their chlorides in molten kingdom?

(a) (i) and (iv)

(b) (iii) and (iv)

(c) (i) and (iii)

(d) (i) and (ii)

The answer is (d) (i) and (ii)

Sodium and Calcium are within the pinnacle in reactivity collection

19. Generally, non-metals aren’t lustrous. Which of the following nonmetal is lustrous?

The answer is (d) Iodine

20. Which one of the following four metals might be displaced from the solution of its salts via the other three metals?

The answer is (b) Ag

Because silver is a non-reactive steel it may be displaced without difficulty.

21. 2 mL every of concentrated HCl, HNO3 and a mixture of focused HCl and focused HNO3 inside the ratio of three: 1 have been taken in take a look at tubes labelled as A, B and C. A small piece of steel changed into put in each test tube. No alternate befell in take a look at tubes A and B but the metallic were given dissolved in take a look at tube C respectively. The metal may be

The answer is (b) Au

Answer is gold because answer C is a mixture of Concentrated HCL and Concentrated HNO3 that’s called aqua regia. Aqua Regia dissolves gold.

(c) a homogeneous aggregate

(d) a heterogeneous mixture

The solution is (c) a homogeneous aggregate

An Alloy is a homogeneous mixture due to the fact its composition is uniform.

23. An electrolytic cell includes

(i) undoubtedly charged cathode

(ii) negatively charged anode

(iii) definitely charged anode

(iv) negatively charged cathode

(a) (i) and (ii)

(b) (iii) and (iv)

(c) (i) and (iii)

(d) (ii) ad (iv)

The solution is (b) (iii) and (iv)

24. During electrolytic refining of zinc, it gets

(a) deposited on cathode

(b) deposited on anode

(c) deposited on the choices cathode in addition to anode

(d) remains in the answer

The solution is (a) deposited on cathode

Zinc is definitely charged for this reason it movements closer to the negatively charged cathode.

25. An detail A is tender and may be reduce with a knife. This may be very reactive to air and cannot be saved open inside the air. It reacts vigorously with water. Identify the detail from the subsequent

The answer is (b) Na

Sodium is tender which may be cut with a knife. Sodium reacts with water and air vigorously as a result it’s far kept in kerosene.

26. Alloys are homogeneous mixtures of a steel with a metallic or nonmetal. Which a number of the following alloys contain non-metal as one of its parts?

The solution is (d) Steel

Steel is an alloy made from carbon and iron where carbon is a non-metal.

27. Which the various following statements is wrong for magnesium metallic?

(a) It burns in oxygen with a spectacular white flame

(b) It reacts with cold water to shape magnesium oxide and evolves hydrogen gas

(c) It reacts with hot water to shape magnesium hydroxide and evolves hydrogen gasoline

(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gasoline

The solution is (b) It reacts with cold water to shape magnesium oxide and evolves hydrogen fuel

Magnesium reacts with cold water to form magnesium oxide and evolves hydrogen gasoline is a wrong declaration because Magnesium Hydroxide is shaped now not Magnesium oxide.

28. Which a number of the following alloys comprise mercury as one in all its parts?

The solution is (d) Zinc amalgam

Zinc amalgam is an alloy of Mercury and Zinc

29. Reaction among X and Y, forms compound Z. X loses electron and Y profits electron. Which of the subsequent properties isn’t always proven by means of Z?

(a) Has a excessive melting factor

(b) Has a low melting point

(c) Conducts power in molten kingdom

(d) Occurs as solid

The answer is (b) Has a low melting factor

Here Z is an ionic compound and Ionic compounds have melting factor as a result option b) is a wrong assertion.

30. The digital configurations of 3 elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, eight, 2. Which of the following is accurate?

(a) X is a metallic

(b) Y is a metal

(c) Z is a non-metallic

(d) Y is a non-steel and Z is a metallic

The solution is (d) Y is a non-steel and Z is a metallic

Element Y has three electron in its outer that is electronegative in nature. Z has 2 electrons in its outermost shell for this reason it’s miles electropositive. Hence it is a steel.

31. Although metals shape simple oxides, which of the following metals form an amphoteric oxide?

The solution is (c) Al

Oxides of Aluminum are both acidic and simple in nature. Hence aluminium oxides are amphoteric in nature.

32. Generally, non-metals aren’t conductors of electricity. Which of the following is a good conductor of power?

The solution is (b) Graphite

33. Electrical wires have a coating of an insulating cloth. The cloth, usually used is

(d) All can be used

Answer is (c) PVC

Sulphur is brittle in nature, as a result it is able to be used and Graphite is a superb conductor of energy therefore it can not be used as an insulator.

34. Which of the following non-metals is a liquid?

The answer is (b) Bromine

35. Which of the following can go through a chemical reaction?

The answer is (d) CuSO4 + Fe

Iron is extra reactive than copper as a result it displaces copper within the reaction to shape Feso4.

36. Which one of the following figures efficaciously describes the choices process of electrolytic refining?

The answer is b)

Copper ions are dispersed from the definitely charged anode and deposited on the choices negatively charged cathode.

37. Iqbal handled a lustrous, divalent detail M with sodium hydroxide. He observed the choices formation of bubbles in a reaction aggregate. He made the choices equal observations when this element became dealt with with hydrochloric acid. Suggest how can he identify the choices produced gasoline. Write chemical equations for each the choices reactions.

To discover the choices produced gas, lighted matchstick need to be brought close to the choices gas. If match stick burns with a “pop” sound, it indicates the evolution of Hydrogen gasoline.

M+ 2NaOH → Na2MO2+ H2

M+ 2HCl →MCl2+H2

38. During the extraction of metals, electrolytic refining is used to attain natural metals. (a) Which cloth will be used as anode and cathode for refining of silver metallic by this manner? (b) Suggest a appropriate electrolyte also. (c) In this electrolytic cellular, where do we get pure silver after passing electric modern-day?

39. Why ought to the metal sulphides and carbonates be transformed to steel oxides within the technique of extraction of steel from them?

Metal sulphides and carbonates are converted to metal oxides within the procedure of extraction of metal from them because metals can be acquired easier in oxide form than its sulphide or carbonate shape.

forty. Generally, when metals are dealt with with mineral acids, hydrogen gas is liberated, however whilst metals (except Mn and Mg), handled with HNO3, hydrogen is not liberated, why?

HNO3 is a strong oxidizing agent. It oxidises the liberated Hydrogen into the choices water while changing itself to nitrogen oxide.

41. Compound X and aluminium are used to sign up for railway tracks. (a) Identify the compound X (b) Name the reaction (c) Write down its reaction.

42. When a steel X is handled with bloodless water, it gives a simple salt Y with molecular formula XOH (Molecular mass = forty) and liberates a gas Z which without difficulty catches fire. Identify X, Y and Z and additionally write the choices response worried.

X is Na due to the fact the choices molecular mass of NaOH is 40.

Hence Y is NaOH

Z is hydrogen has which catches hearth when reacts with water.

2Na+2H2O → 2NaOH+H2

forty three. A non-metallic X exists in two special paperwork Y and Z. Y is the choices hardest herbal substance, whereas Z is a great conductor of energy. Identify X, Y and Z.

X is Carbon, Y and Z are Diamond and Graphite, that are allotropes of the carbon.

44. The following response takes region whilst the choices aluminium powder is heated with MnO2

3 MnO2 (s) + 4 Al (s) → 3 Mn (l) + 2 Al2O3 (l) + Heat

(a) Is aluminium getting decreased? (b) Is MnO2 getting oxidised?

In this response, aluminium receives oxidized as oxygen gets mixed with it. Since oxygen is eliminated from MnO2, it is getting reduced.

45. What are the choices elements of solder alloy? Which assets of solder makes it suitable for welding electrical wires?

Solder alloy is made of Lead and aluminium. Its low melting point makes it appropriate for welding electric wires.

forty six. A steel A, which is utilized in thermite technique, while heated with oxygen offers an oxide B, that is amphoteric in nature. Identify A and B. Write down the choices reactions of oxide B with HCl and NaOH.

Metal A is Aluminium and B is Al→2O3

Al2O3+ 6HCl →2AlCl3+3H2O

Al2O3+2NaOH →2NaAlO2+H2O

47. A metallic that exists as a liquid at room temperature is obtained through heating its sulphide inside the presence of air. Identify the choices metal and its ore and supply the reaction involved.

Mercury is the metallic which is liquid at room temperature. Ore of Mercury is Cinnabar. When we warmth cinnabar in atmospheric oxygen following response takes location.

2HgS + 3O2→ 2HgO + 2SO2

Mercuric oxide is once more heated to get Mercury and Oxygen

2HgO (oversetrightarrow) Hg+O2

48. Give the formulae of the solid binary compounds that might be fashioned by means of the mixture of the following pairs of factors.

(a) Mg and N2

(b) Li and O2

(c) Al and Cl2

(d) K and O2

(a) ZnCO3 is heated within the absence of oxygen?

(b) a mixture of Cu2O and Cu2S is heated?

a) When ZnCO3 is heated within the absence of oxygen Zinc Oxide and Carbon-di-oxide are liberated.

b) When a aggregate of Cu2O and Cu2S is heated, we get natural copper

2 Cu2O+ Cu2S →6Cu+SO2

50. A non-metal A is an essential constituent of our meals and forms oxides B and C. Oxide B is toxic whereas C reasons global warming

(a) Identify A, B and C

(b) To which Group of Periodic Table does A belong?

a) A is Carbon. B is Carbon monoxide and C is Carbon-dioxide

fifty one. Give examples every: The metals that are excellent conductors and poor conductors of warmth, respectively.

Good conductors- Iron and Copper

Bad conductors- Lead and Mercury

fifty two. Name one metal and one non-metallic that exist in a liquid kingdom at room temperature. Also, call metals having a melting point less than 310 K (37°C)

Mercury and Bromine are liquid at room temperature. Caesium and Gallium are the choices metals whose melting factor is less than 310K(37°c).

fifty three. An element A reacts with water to form a compound B that’s used in whitewashing. The compound B on heating bureaucracy an oxide C which on treatment with water gives back B. Identify A, B and C and deliver the reactions concerned.

A is calcium, B is calcium Hydroxide, and C is Calcium Oxide.

Ca+2H2O →Ca(OH)2+ H2

Ca(OH)2 →CaO+H2O

CaO+H2O→ Ca(OH)2

fifty four. An alkali metal A gives a compound B (molecular mass = forty) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and deliver the reaction concerned.

A is sodium and B is Sodium Hydroxide. Because the molecular mass of NaOH is forty. So C is Sodium Aluminate.

Al2O3 +2NaOH →2NaAlO2+H2O

fifty five. Give the choices response worried in the course of the extraction of zinc from its ore by (a) roasting of zinc ore (b) calcination of zinc ore

56. A metallic M does not liberate hydrogen from acids however reacts with oxygen to provide a black coloration product. Identify M and black coloured product and additionally provide an explanation for the reaction of M with oxygen.

Copper is the choices metal which does not react with acids. With oxygen, it paperwork Copper Oxide.

Metal M is Copper and black colored product is copper oxide.

fifty seven. An element paperwork an oxide A2O3 that’s acidic in nature. Identify A as steel or non-steel.

A is a non-steel due to the fact oxides of non-metals are acidic in nature.

58. A answer of CuSO4 become stored in an iron pot. After a few days, the iron pot become found to have some of holes in it. Explain the purpose in terms of reactivity. Write the equation of the choices response worried.

Iron is more reactive than copper subsequently Iron displaces Copper to provide FeSO4. In this procedure, a part of Iron Gets dissolved which ends up in Holes in the pot.

Fe+ CuSO4 →FeSO4+ Cu

59. A non-metallic A that’s the largest constituent of air, while heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) offers a fuel B. On heating with O2 it gives an oxide C. If this oxide is handed into water inside the presence of air, it offers an acid D which acts as a sturdy oxidising agent.

(a) Identify A, B, C and D

(b) To which institution of periodic desk does this non-metal belong?

a)Non-metal “A” is nitrogen due to the fact it is the biggest constituent of air which represent round 78% of the gases. B is Ammonia, C is Nitrogen-di-oxide and D is Nitric acid.

When heated with H2 in 1:3 ratio within the presence of a catalyst (Fe) following reaction takes location.

On heating Nitrogen with O2, it gives nitrogen-di-oxide

When nitrogen-dioxide is passed into the choices water inside the presence of air, it gives Nitric acid

NO2 + H2O →HNO3

b)Nitrogen belongs to group 15

60. Give the stairs concerned in the extraction of metals of low and medium reactivity from their respective sulphide ores.

During the extraction of metals of low and medium reactivity from their respective sulphide ores.

They are first heated within the presence of atmospheric oxygen. This step will give out oxides of metal. This step is used as it is a greater efficient technique to extract techniques.

Ex: Cinnabar is heated in air to get mercuric sulphide to oxidize to supply mercuric oxide.

2HgS+3O2 →2HgO+2SO2

Mercuric oxide is in addition warmth to get Mercury

Zinc is a metal of medium reactivity, and its ore is Zinc Blende

Zinc Blend is roasted to get Zinc oxide

2ZnS+3O2 →2ZnO+2SO2

Zinc oxide whilst heated wit CO2 Zinc is acquired

ZnO+C→ Zn+CO

(a) Reactivity of Al decreases if it’s miles dipped in HNO3

(b) Carbon can not reduce the choices oxides of Na or Mg

(c) NaCl is not a conductor of energy within the stable-kingdom whereas it does behavior electricity in aqueous solution as well as in molten nation

(d) Iron articles are galvanised.

(e) Metals like Na, K, Ca and Mg are never located of their free nation in nature.

a) Reactivity of Aluminium decreases if it’s far dipped in HNO3 because HNO3 is a robust oxidizing agent. Here, a layer of aluminium oxide gets deposited due to which reactivity of aluminium receives reduced.

(b) Carbon cannot reduce the oxides of Na or Mg due to the fact those are distinctly reactive metals. Na and Mg have a better affinity to oxygen than carbon. Hence carbon fails to reduce the oxides of Na and Mg.

(c) NaCl is not a conductor of power inside the stable-nation while it does behavior strength in aqueous answer as well as in molten country due to the fact NaCl is an ionic compound. Ionic compounds cannot behavior power within the stable-kingdom, however they are able to behavior strength in aqueous answer and in a molten country.

d) Iron without difficulty reacts with atmospheric oxygen and forms rust. To keep away from rusting of iron, it is galvanized.

e) Metals like Na, K, Ca and Mg are enormously reactive metals. They can shape compounds with almost each element. Because of this, they are no longer discovered in their native shape in nature.

62. (i) Given underneath are the steps for extraction of copper from its ore. Write the choices response concerned.

(a) Roasting of copper (1) sulphide

(b) Reduction of copper (1) oxide with copper (1) sulphide.

(ii) Draw a neat and properly-labelled diagram for electrolytic refining of copper

63. Of the 3 metals X, Y and Z. X reacts with bloodless water, Y with hot water and Z with steam best. Identify X, Y and Z and additionally set up them in order of increasing reactivity.

X reacts with bloodless water.

Hence, the detail ought to be Sodium

Na + H₂O → 2NaOH + H₂

Y reacts with hot water; as a result, it is “Magnesium.”

Mg + H₂O → Mg(OH)₂ + H₂

Z reacts with steam simplest. Hence, it’s far Iron

Fe + H₂O → Fe₂O₃+ H₂

Arranging in ascending order (increasing order of reactivity)

sixty four. An element A burns with golden flame in the air. It reacts with any other element B, atomic variety 17 to give a product C. An aqueous solution of product C on electrolysis offers a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the choices reactions involved.

Element A is Sodium because it will burn with a golden flame within the air.

Element B is Chlorine for its atomic quantity is 17.

Product C is Sodium Chloride

Product D is Sodium hydroxide

2NaCl+ 2H2O→ 2NaOH+ Cl2+H2

sixty five. Two ores A and B were taken. On heating ore A offers CO2 while, ore B offers SO2. What steps will you are taking to convert them into metals?

Ore A offers CO2 on heating hence it’s far a carbonate ore

Steps involved in Extraction of ore A

Ore is heated in a confined supply of air to reap a metallic oxide

The steel oxide is reduced with coke to attain metallic.


Ore B is a sulphide ore

Steps concerned in the extraction of detail B are

Ore is heated in the presence of air to achieve a steel oxide

2BS+3O2→ 2BO+2SO2

The metallic oxide is decreased to steel with the aid of carbon


Metals and non-metals Class 10 Exemplar provide you with vital insights on the ideas involved and makes you ready to stand one of a kind kinds of questions. This exemplar has Metals and Non-metals Class 10 essential questions and solutions, metals and non-metals Class 10 more questions, query bank on metals and non-metals Class 10 and crucial query taken from the preceding yr question paper.

Important subjects of Class 10 Metals and Non-metals

The faculties affiliated with CBSE are recommended to follow the NCERT curriculum and textbooks. NCERT textbooks are one of the first-class study materials for the scholars of Class 10 NCERT with all subjects covered within the CBSE syllabus (up to date 2021-2022).

To score proper marks inside the examination; students have to solve the choices preceding yr question papers and sample papers, solving the choices previous 12 months query papers will help the students to determine the problem degree of the questions and the marking scheme. For comprehensive getting to know opportunity, visit BYJU’S internet site or download BYJU’S mastering App.

Frequently Asked Questions on NCERT Exemplar Solutions for Class 10 Science Chapter three Mention the topics included in Chapter three of NCERT Exemplar Solutions for Class 10 Science.The subjects blanketed within the Chapter three of NCERT Exemplar Solutions for Class 10 Science are – 3.1 Physical Properties three.1.1 Metals 3.1.2 Non-metals three.2 Chemical Properties Of Metals three.2.1 What Happens When Metals Are Burnt In Air? three.2.2 What Happens When Metals React With Water? 3.2.three What Happens When Metals React With Acids? 3.2.four How Do Metals React With Solutions Of Other Metal Salts?How to stability the choices chemical equations found in Chapter 3 of NCERT Exemplar Solutions for Class 10 Science faster?Students of Class 10 should discover ways to write chemical equations present within the NCERT textbook to get an concept about the choices important equations found in them. If doubts stand up whilst writing the equations inside the exercising problems, students can seek advice from the choices NCERT Exemplar Solutions for Class 10 Science from BYJU’S in which each and each question is solved appropriately. The answers contain reasons for each step to help students recognize the choices method of writing the choices chemical equations with none problem.What are the key features of NCERT Exemplar Solutions for Class 10 Science Chapter 3?The key functions of NCERT Exemplar Solutions for Class 10 Science Chapter 3 are – 1. The answers are prepared with the aid of exceptionally experienced technology specialists. 2. The solutions are accurate without any blunders based on the contemporary CBSE syllabus. three. Every important subject matter is explained in a easy language to assist students rating nicely within the tests. four. Students get an intensive information of the choices critical principles the usage of the choices NCERT Exemplar Solutions from BYJU’S.

Frequently Asked Questions on NCERT Exemplar Solutions for Class 10 Science Chapter three

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