41)Which of the following is mixture ?
a) Distilled water
b) Gasoline
c) Liquified petroleum gas
d) Both (b) , (c)
42) Diamond is _
a) An element
b) A compound
c) A mixture
d) A liquid
43) The product of equivalent weight and valency of an element is equal to _
a) Vapour density
b) Specific heat
c) Atomic weight
d) Molecular weight
44) The most abundant metal in earth crust is _
a) Iron
b) Magnesium
c) Calcium
d) Aluminium
45) The isotopes of chlorine with mass number 35 and 37 exist in the ratio of _
a) 1 :2
b) 2 :3
c) 3 : 1
d) 3 :4
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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