reacts with concentrated 
to give colourless fumes with pungent smell. But on adding 
the
fumes become
greenish yellow.
Reason (R) oxidises HCl to chlorine gas which
is greenish yellow.
Answer:
(a)
Both assertion and reason are correct statements, and reason is the correct explanation
of the assertion.
reacts with concentrated
to give colourless fumes with
pungent smell.
Pungent smell is due to formation of HCl.
But on adding 
the fumes
become greenish yellow due to formation of chlorine gas.
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