Answer:
(a)
White powder may be carbonate or bicarbonate, which evolves CO2 on
reacting with dilute acid. CO2 gas turnes lime water milky.
(1)
(b)
Set up (II) is the most appropriate for the evolution of H2 gas and
its identification
It
is because the gas evolved is tested properly such that delivery tube does not
dip in the solution. (1)
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