ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

State how a ‘supersaturated’ solution differs from a ‘saturated solution’. State briefly how you would prepare a supersaturated solution using potassium chloride and water.

Explain in brief – Lod Rutherford’s experiment which led to the discovery of the atomic nucleus.

‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.

State what is meant by the ‘reactivity series of metals’

With reference to Water explain with suitable examples of how the reactivity of the metals could be differentiated.

With reference to Acid explain with a suitable example of how the reactivity of the metals could be differentiated.

Give a balanced equation for the reversible catalytic reaction involving nitrogen as one of the reactants.

Select the correct answer for the statement given below:

The catalyst used in the catalytic reaction involving the reactants nitrogen and hydrogen.

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.