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

Give the assumptions of the kinetic molecular theory.

Explain Charles'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:

Mountaineers carry oxygen cylinders with them.

How did Charles's law lead to the concept of an absolute scale of temperature?

State the following:

Ice point in absolute temperature

Choose the correct answer:

The absolute temperature value that corresponds to 27°C is

Choose the correct answer:

The volume-temperature relationship is given by

What will be the minimum pressure required to compress 500 dm³ of air at 1 bar to 200 dm³ temperature remaining constant?

2 liters of gas is enclosed in a vessel at a pressure of 760 mmHg. If the temperature remains constant, calculate pressure when volume changes to 4 dm³.

88 cm³ of nitrogen is at a pressure of 770 mm mercury. If the pressure is raised to 880 mmHg, find by how much the volume will diminish, the temperature remaining constant.

Calculate the final volume of a gas 'X' if the original pressure of the gas at STP is doubled and its temperature is increased three times.

It is found that on heating a gas its volume increases by 50% and its pressure decreases to 60% of its original value. If the original temperature was −15°C, find the temperature to which it was heated.

2500 cm³ of hydrogen is taken at STP. The pressure of this gas is further increased by two and a half times (temperature remaining constant). What volume will hydrogen occupy now?

Taking the volume of hydrogen as calculated in Q.19, what change must be made in Kelvin (absolute) temperature to return the volume to 2500 cm³ (pressure remaining constant)?

An LPG cylinder can withstand a pressure of 14.9 atmospheres. The pressure gauge of the cylinder indicates 12 atmospheres at 27°C. Because of a sudden fire in the building, the temperature rises. At what temperature will the cylinder explode?

State Charles's law.

Give its

(i) graphical representation,

(ii) mathematical expression

(iii) significance

Correct the following statement:

The volume of a fixed mass of a gas is directly proportional to its temperature, pressure remaining constant.

Name the gas that.

Turns moist starch iodide paper blue black.