ICSE ICSE Class 8 - CISCE Question Bank Solutions

Select the correct answer for the statement given below:

A neutral oxide which does not react with an acid or a base to give salt and water.

Complete the statement by filling in the blank with the correct word:

The metal which reacts with steam and the reaction is reversible is ________.

Give a balanced equation for the following type of reaction:

A displacement reaction in which a metal above hydrogen in the reactivity series, displaces another metal from the solution of its compound.

How will you obtain Ammonia from nitrogen.
Also give balanced equations for the reactions

What do you observe when Ammonia is brought in contact of hydrogen chloride.gas.

Define exothermic reactions. Give two examples of each.

Define  endothermic reactions. Give two examples of each.

State the effect of an endothermic reaction.

State the effect of  an exothermic reaction on the surroundings.

What do you observe when ammonium chloride is dissolved in water.

MULTIPLE CHOICE QUESTIONS

Tick the most appropriate answer.

Heat energy is evolved in these reactions

1. Thermal decomposition reactions
2. Exothermic reactions
3. Endothermic reactions
4. None of these

FILL IN THE BLANK 

In a................ reaction heat energy is absorbed.

State which type of chemical reaction proceeds with evolution of heat energy.

State which type of chemical reaction proceeds with the absorption of heat energy.

State the following reaction whether heat is evolved or absorbed – 

water is added to quicklime

State the following reaction whether heat is evolved or absorbed – 

Two neutral gases on passage through an electric are given nitric oxide.

State the following reaction whether heat is evolved or absorbed – 

Two neutral gases combine to give a basic gas.

Complete the statement by filling in the blank with the correct word:

The element molybdenum used in the reaction of nitrogen with hydrogen at elevated temperatures is an example of a ________.

Complete the statement by filling in the blank with the correct word:

The reaction of coke with steam to give water gas is an example of an __________ reaction.

Give a balanced equation for the following type of reaction:

A catalytic, reversible, exothermic reaction.