61.
Entropy of Universe is always

62.
In a reaction of the type A+B -> C+D one could ensure it to be a first order reaction by :

63.
Kinetics is the study of:

64.
Bhopal gas tragedy is associated with leakage of

65.
The function of sedimentation tank in sewage treatment is to:

66.
Ferrous sulphate is used in water treatment as a/an

67.
Charcoal is used in water treatment as a/an

69.
Ultraviolet radiation striking the earth is due to the depletion of

70.
Many people died in London in 1952 as result of air pollution producing