NCERT Class 10 Chapter 5 Metals and Non-Metals CBSE Board Sample Problems Very Short Answer (For CBSE, ICSE, IAS, NET, NRA 2022)
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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 is 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)