EASY
10th CBSE
IMPORTANT
Earn 100

Give reasons for the following: Articles made of aluminium do not corrode even though aluminium is an active metal.

Important Questions on Metals And Non-Metals

EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 4
State reasons for the following: Aluminium oxide is called an amphoteric oxide.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 4
State reasons for the following: Sodium and potassium metals are kept immersed under kerosene oil.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 4
State reasons for the following: Hydrogen gas is not evolved when most metals react with nitric acid.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 5
Name a metal in each case:
(i) it does not react with cold or hot water, but reacts with steam.
(ii) it does not react with any physical state of water.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 5
When calcium metal is added water, the gas evolved does not catch fire, but the same gas evolved on adding sodium metal to water catches fire. Why is it so?
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 6
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the gas produced. Write chemical equations for both the reactions.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 7
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z, which easily catches fire. Identify X, Y and Z and also write the reaction involved.
EASY
10th CBSE
IMPORTANT
Core Science Chemistry>Chapter 3 - Metals And Non-Metals>EXERCISE 3C>Q 8
Explain the following: Reactivity of Al decreases if it is dipped in HNO3