21) White lead is
a) a double salt
b) a normal salt
c) an acid salt’
d) a basic salt
22) The ore which is found in abundance in India is
a)monazite
b)bauxite
c)magnetite
d)fluorspar
23) The best specimen of drinking purpose is
a) river water
b) rain water
c) deep well water
d) conductivity water
24) Ozone is :
a)Non-magnetic
b)Paramagnetic
c)Ferromagnetic
d)Diamagnetic
25) Which among the following is a metalloid?
a) Silver
b) copper
c) Arsenic
d) Iodin
26) Acid rain is due to air pollution by ?
a)Carbon dioxide
b)Carbon monoxide
c)Methane
d)Nitrous oxide and Sulphur dioxide
27) Rusting is a special case of corrosion applied to
a) iron
b) nickel
c) Chromium
d) tin
28) The most abundant rare gas in the atmosphere is ?
a)He
b)Ne
c)Ar
d)Xe
29) What among following is used to produce artificial rain ?
a)copper oxide
b)carbon monoxide
c)silver iodide
d)silver nitrate
30) The chemical used as a fixer in photography is ?
a)sodium thiosulphate
b)sodium sulphate
c)borax
d)ammonium sulphate