(English Medium) ICSE Class 10 - CISCE Important Questions for Chemistry

A compound which undergoes thermal dissociation.

On passing ammonia gas over heated copper oxide for some time, a reddish-brown residue is left behind. What property of ammonia is demonstrated here?

Ammonia burns in oxygen, as shown below.

\[\ce{4NH3 + 3O2 -> 2N2 + 6H2O}\]

If 240 cc of ammonia is burnt in 300 cc of oxygen, find out the composition of the resultant gaseous mixture at room temperature.

Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes ammonia gas over heated copper oxide. What will she observe?

Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes ammonia gas over heated copper oxide.

Write a balanced chemical equation for the Black copper oxide changes to a reddish brown/pink copper reaction.

Write a balanced chemical equation for the following:

Action of cold and dilute Nitric acid on Copper

Give a balanced chemical equation for Action of conc. Nitric acid on Sulphur

Write balanced chemical equations for Action of hot and concentrated Nitric acid on copper

Fill in the blanks using the appropriate words given below :

(Sulphur dioxide, nitrogen dioxide, Nitric oxide, Sulphuric acid)

Hot, concentrated nitric acid reacts with sulphur to form ______________.

Name the gas evolved when the following mixtures are heated.

Sodium Nitrite and Ammonium Chloride

State one relevant observation for the following:

When crystals of copper nitrate are heated in a test tube.

 Explain the following:

Dilute nitric acid is generally considered a typical acid but not so in its reaction with metals.

Explain the following:

Concentrated nitric add appears yellow when it is left standing in a glass bottle.

Explain the following:

An all-glass apparatus is used in the laboratory preparation of nitric acid.

Write a balanced equation for the action of heat on a mixture of copper and concentrated nitric acid.

Write a balanced equation for the action of warm water on magnesium nitride.

Name the gas that is produced in the given cases :

Sulphur is oxidized by concentrated nitric acid.

Name the gas that is produced in the given case:

The action of cold and dilute nitric acid on copper

What is the type of salt formed when the reactants are heated at a suitable temperature for the preparation of Nitric acid?

State one observation for the following:

Concentrated nitric acid is reacted with sulphur.