UPSC Government Jobs Exams

When an iron nail is dipped in a
solution of copper sulphate, the
iron nail becomes brownish in
colour and the blue colour of
copper sulphate solution fades after
some time. The reaction is an
example of chemical
(a) combination
(b) decomposition
(c) displacement
(d) double displacement

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UPSC Other Question

In the recent past, a fundamental
particle has been claimed to be
experimentally observed, at a
European Laboratory in Geneva, to
travel at a speed greater than that
of light in vacuum. The name of the
particle is
(a) electron
(b) positron
(c) neutron
(d) neutrino
Bleaching powder is added in water
used for drinking purpose. The role
of bleaching powder in this case is
(a) of disinfectant
(14 of bleaching agent
(c) to remove impurity
(d) to decrease the pH