GK English Chemistry Prepare Q&A Page: 4
20249.The most commonly used bleaching agent is
alcohol
carbon dioxide
chlorine
sodium chlorine
20272.The mass number of a nucleus is
always less than its atomic number
the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight
a fraction
20283.Zone refining is used for the purification of
20266.The most malleable metal is
platinum
silver
iron
gold
20268.The number of waves in n x 10th Bohrs orbit are
20297.The hardest form of carbon is
coke
graphite
diamond
charcoal
20314.The inert gases are ____ in water
sparingly soluble
insoluble
soluble
None of these
20308.Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
2 : 16 : 2
2 : 16 : 1
1 : 16 : 2
1 : 1 : 1
20279.The most electropositive elements among the following is
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