61.  What is the average value of salt present in sea water?

62.  Disadvantage of using DDT as pesticide is -

63.  The two specific Heats of gases are related by-

64.  What is the Main Source of Manufacturing of Nitrogenous Fertilizer?

65.  What happens during the charging of Lead operated battery?

66.  Plaster of Paris is made by the Partial dehydration of -

67.  Lime water becomes milky when exposed to air due to the presence of -

68.  Venturimeter is used to measure the-

69.  When Hydrogen combusts in air, then formed-

70.  Gas used as a fire extinguisher is

71.  Chemically Lime water is -

72.  Which gas is used for converting vegetable oils into saturated fats -

73.  Enzyme which coagulate the milk into curd-

74.  Process of Removal of calcium and Magnesium is known as -

75.  Water gas is a Mixture of-