An inorganic salt when heated evolves coloured gas which bleaches moist litmus paper. The evolve...

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An inorganic salt when heated evolves coloured gas which bleaches moist litmus paper. The evolved gas is:
(a) \( \mathrm{NO}_{2} \)
(b) \( \mathrm{SO}_{2} \)
(c) \( \mathrm{N}_{2} \mathrm{O} \)
(d) \( \mathrm{I}_{2} \)
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