NCERT Class 10 Chapter 5 Metals and Non-Metals CBSE Board Sample Problems Very Short Answer

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Question

Assertion: Metals are malleable.

Reason: They can be easily hammered into thin sheets.

Solution

Both Assertion and Reason are true and reason is the correct explanation of assertion.

Question

Name the metal:

a) It does not reacts with cold as well as hot water but reacts with steam.

b) It does not reacts with any physical state of water.

Solution

a) Iron

b) Copper

Question

Why do we use copper and aluminium wire for transmission of electric current?

Solution

They have low resistance and ductile

Question

Which of the following metals will melt at body temperature?

Gallium, Magnesium, Caesium, Aluminium

Solution

Gallium & Caesium

Question

A mixture of and is heated. Write a balanced chemical equation.

Solution

Question

Carbonate and Sulphide ores are usually converted into oxide during the process of extraction. Give reason.

Solution

Ores are converted into oxide because oxygen is a very reactive element and is very abundant on the earth.

Question

Name two metals which will displace hydrogen from dilute acids.

Solution

Magnesium and Aluminium will displace hydrogen as they are more reactive and are placed at a higher position in the reactivity series.

Question

Rohan observed that if a small piece of sodium is added to water it catches fire whereas a piece of calcium added to the water it does not catch fire. Can you explain his observations with the help of the chemical equations?

Solution

Sodium produces hydrogen gas on reacting with water. This reaction is highly exothermic and hydrogen gas formed catches fire immediately.

The reaction of calcium with water is less violent heat evolved is not sufficient for hydrogen to catch fire.

Question

Name a non-metal which is lustrous.

Solution

Iodine

Question

What ¡s anodising?

Solution

The process of formation of a thick oxide layer of aluminium is called anodising.

Question

When most of the metals are treated with nitric acid they do not produce hydrogen gas. Why?

Solution

is a strong oxidizing agent and it oxidizes the hydrogen produced to .

Question

Mehak observed that a green coat is gradually formed on a copper plate left exposed to air in her room. Identify the chemical name of the green layer? (1)

Solution

Basic Copper Carbonate (1)