46) In known elements , the maximum number is of _
a) Metals
b) Non-metals
c) Metalloids
d) None of above
47) Which one of the compound in the following _
a) Mercury
b) Ozone
c) Air
d) Ammonia
48) An alloy is _
a) A compound
b) An allotropic form
c) An isomer
d) A mixture
49) The best standard of atomic mass is _
a) Carbon – 12
b) Oxygen -16
c) Hydrogen – 1.008
d) Chlorine – 35.5
50) Which of the proportion of the element is a whole number ?
a) Atomic mass
b) Atomic number
c) Atomic radius
d) Atomic volume
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