61. The hardest form of carbon is
62. The most important ore of aluminium is
63. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of
64. The number of electrons presents in H+ is
65. The hottest part of the gas flame is known as
66. The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is
67. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is
68. The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
69. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3
70. The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
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