(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Why does the hardness of water render it unfit for use in a boiler.

Why does the hardness of water render it unfit for use in a washing purposes.

Define the term: Element

Define the term: Element

Write the balanced equation and give your observation when the following metal reacts:

Sodium with cold water

Write the balanced equation and give your observation when the following metal reacts:

Calcium with cold water

Write the balanced equation and give your observation when the following metal reacts:

Magnesium with boiling water

Write the balanced equation and give your observation when the following metal reacts:

Magnesium with steam

Give the balanced equation of the reaction.

Choose the correct option:

The composition of the nucleus of deuterium is

Choose terms from the options given in brackets to complete this sentence.

A metal …………….. hydrogen in the activity series gives hydrogen with …………… acid or …………… acid.

(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric). 

Correct the following statement:

Hydrogen is dried by passing it through conc. H₂SO₄.

Explain Boyle's Law on the basis of the kinetic theory of matter.

State the law which is represented by the following graph:

Give reasons for the following:

Inflating a balloon seems to violate Boyle's law.

Give reasons for the following:

It is necessary to specify the pressure and temperature of gas while stating its volume.

Choose the correct answer:

If the pressure is doubled for a fixed mass of a gas, its volume will become

At constant temperature, the effect of change of pressure on the volume of a gas was as given below:

(a) Plot the following graphs

1. P vs V
2. P vs 1/V
3. PV vs P

Interpret each graph in terms of the law.

(b) Assuming that the pressure values given above are correct, find the correct measurement of the volume. 

A steel cylinder of internal volume 20 litres is filled with hydrogen at 29 atmospheric pressure. If hydrogen is used to fill a balloon at 1.25 atmospheric pressure at the same temperature, what volume will the gas occupy?

561 dm³ of a gas at STP is filled in a 748 dm³ container. If the temperature is constant, calculate the percentage change in pressure required.