51.
Indane gas is mixture of

52.
The charcoal used to decolourise brown sugar solution is

54.
Domestic cooking gas consists mostly of

55.
Which one of the following is known as the 'brown coal'?

58.
Which of the following is used to increase the anti-knocking property of petrol ?

59.
The quality of petrol is expressed in terms of

60.
Which of the following type of coal has the lowest proportion of volatile matter ?