61.
Activated Charcoal is used to remove colouring matter from pure substances by

62.
The molecular mass of a gas is

63.
The value of gas constant R in Ergs deg–1 mole–1 is

64.
The absolute temperature of a gas is doubled and the pressure is reduced to half, the volume of the gas

65.
Isobars are lines joining places having equal

66.
Two moles of an ideal gas expand freely into vacuum. The work done by the gas is

67.
The Fungus which is used in the alcohol industry is

68.
Which of the following is used to denature ethanol ?

69.
Ethanol containing 5% water is known as

70.
Alcohol prepared by the distillation of wood is :