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

A gas at 240 K is heated to 127°C. Find the percentage change in the volume of the gas (pressure remaining constant).

A certain amount of a gas occupies a volume of 0.4 litre at 17°C. To what temperature should it be heated so that its volume gets (a) doubled, (b) reduced to half, pressure remaining constant?

At 0°C and 760 mmHg pressure, a gas occupies a volume of 100 cm³. Kelvin temperature of the gas is increased by one-fifth and the pressure is increased one and a half times. Calculate the final volume of the gas.

A certain mass of a gas occupies 2 litres at 27°C and 100 Pa. Find the temperature when volume and pressure become half of their initial values.

Calculate the volume occupied by 2 g of hydrogen at 27°C and 4-atmosphere pressure if at STP it occupies 22.4 litres.

Calculate the volume of dry air at STP that occupies 28 cm³ at 14°C and 750 mmHg pressure when saturated with water vapour. The vapour pressure of water at 14°C is 12 mmHg.

22.4 litres of gas weighs 70 g at STP. Calculate the weight of the gas if it occupies a volume of 20 litres at 27°C and 700 mmHg of pressure.

State Boyle’s Law.

Give its

(i) mathematical expression

(ii) graphical representation and

(iii) significance.

Correct the following statement:

The volume of a gas is inversely proportional to its pressure at a constant temperature.

50 cm³ of hydrogen is collected over water at 17°C and 750 mmHg pressure. Calculate the volume of a dry gas at STP. The water vapour pressure at 17°C is 14 mmHg.

A given mass of a gas occupied 143 cm³  at 27° C and 700 mm Hg pressure. What will be its volume at 300 K and 280 mm Hg pressure?

Name the gas that:

Does not affect acidified K₂Cr₂O₇ paper but turns lime water milky.

Give a test to differentiate between two gas jars – one containing pure hydrogen and the other hydrogen-air mixture.

A gas cylinder having a capacity of 20 litres contains a gas at 100 atmos. How many flasks of 200 cm³ capacity can be filled from it at 1 atmos. pressure if the temperature remains constant?

Name or state the following:

The law which studies the relationship between pressure of a gas and the volume occupied by it at constant temperature.

Calculate the volume of a gas ‘A’ at s.t.p., if at 37°C and 775 mm of mercury pressure, it occupies a volume of `9 1/2` litres.

Calculate the following:

Calculate the temperature at which a gas ‘A’ at 20°C having a volume, of 500 cc. will occupy a volume of 250 cc.

Calculate the following:

A gas ‘X’ is collected over water at 17°C and 750 mm. pressure. If the volume of the gas collected is 50 cc., calculate the volume of the dry gas at s.t.p. [at 17°C the vapour pressure is 14 mm.]

Assuming temperature remaining constant calculate the pressure of the gas in the following:

The pressure of a gas having volume 1000 cc. originally occupying 1500 cc. at 720 mm. pressure.