NCERT solutions Science Textbook for Class 10 chapter 3 Metals and Non-metals



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Chapter 3 - Metals and Non-metals

Page 40

Give an example of a metal which is a liquid at room temperature.

Q 1.1 | Page 40 | view solution

Give an example of a metal which is the best conductor of heat.

Q 1.2 | Page 40 | view solution

Give an example of a metal which is a poor conductor of heat.

Q 1.3 | Page 40 | view solution

Give an example of a metal which can be easily cut with a knife.

Q 1.4 | Page 40 | view solution

Explain the meanings of malleable and ductile.

Q 2 | Page 40 | view solution

Page 45

Why is sodium kept immersed in kerosene oil?

Q 1 | Page 45 | view solution

Write equations for the reactions of iron with steam 

Q 2.1 | Page 45 | view solution

 Write equations for the reactions of calcium and potassium with water

Q 2.2 | Page 45 | view solution

 Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.

Metal Iron (II) sulphate Cooper (II) sulphate Zinc sulphate Silver nitrate
A. No reaction Displacement    
B. Displacement   No reaction  
C. No reaction No reaction No reaction Displacement
D. No reaction No reaction No reaction No reaction

Use the Table above to answer the following questions about metals A, B, C and D.
(i) Which is the most reactive metal?
(ii) What would you observe if B is added to a solution of copper (II) sulphate?
(iii) Arrange the metals A, B, C and D in the order of decreasing reactivity.

Q 3 | Page 45 | view solution

Which gas is produced when dilute hydrochloric acid is added to a reactive metal? 

Q 4.1 | Page 45 | view solution

Write the chemical reaction when iron reacts with dilute H2SO4.

Q 4.2 | Page 45 | view solution

What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.

Q 5 | Page 45 | view solution

Page 49

Write the electron-dot structures for sodium, oxygen and magnesium.

Q 1.1 | Page 49 | view solution

Show the formation of Na2O and MgO by the transfer of electrons.

Q 1.2 | Page 49 | view solution

What are the ions present in Na2O and MgO compounds?

Q 1.3 | Page 49 | view solution

Why do ionic compounds have high melting points

Q 2 | Page 49 | view solution

Page 53

Define the Ore.

Q 1 | Page 53 | view solution

Name two metals which are found in nature in the free state.

Q 2 | Page 53 | view solution

What chemical process is used for obtaining a metal from its oxide?

Q 3 | Page 53 | view solution

Page 55

Metallic oxides of zinc, magnesium and copper were heated with the following metals.

Metal Zinc Magnesium Copper
Zinc oxide
Magnesium oxide
Copper oxide

In which cases will you find displacement reactions taking place?

Q 1 | Page 55 | view solution

 Which metals do not corrode easily?

Q 2 | Page 55 | view solution

Pages 56 - 57

Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCl2solution and aluminium metal
(c) FeSO4solution and silver metal
(d) AgNO3solution and copper metal.

Q 1 | Page 56 | view solution

Which of the following methods is suitable for preventing an iron frying pan from rusting?

(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) all of the above.

Q 2 | Page 56 | view solution

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be

(a) calcium
(b) carbon
(c) silicon
(d) iron

Q 3 | Page 56 | view solution

Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.

(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.

Q 4 | Page 56 | view solution

You are given a hammer, a battery, a bulb, wires and a switch.

(a) How could you use them to distinguish between samples of metals and non-metals?
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals.

Q 5 | Page 56 | view solution

What are amphoteric oxides? Give two examples of amphoteric oxides.

Q 6 | Page 56 | view solution

 Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

Q 7 | Page 56 | view solution

In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?

Q 8 | Page 57 | view solution

 Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.

(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.

Q 9 | Page 57 | view solution

Write two methods of preventing the rusting of iron.

Q 10 | Page 57 | view solution

What type of oxides are formed when non-metals combine with oxygen?

Q 11 | Page 57 | view solution

Give reasons Platinum, gold and silver are used to make jewellery.

Q 12.1 | Page 57 | view solution

Give reasons Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.

Q 12.2 | Page 57 | view solution

Give reasons Carbonate and sulphide ores are usually converted into oxides during the process of extraction.

Q 12.3 | Page 57 | view solution

You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.

Q 13 | Page 57 | view solution

Differentiate between metal and non-metal on the basis of their chemical properties.

Q 14 | Page 57 | view solution

A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?

Q 15 | Page 57 | view solution

 Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

Q 16 | Page 57 | view solution

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