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Reactivity with Halogens (Group 1)

A substance X...

Question

A substance X when heated with conc. H₂SO₄, liberates a gas which turns moist starch paper blue. The substance X is:

A

NaBr

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B

NaNO₃

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C

NaCl

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D

NaI

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Solution

The correct option is D
NaI

Iodine gas turns the starch paper blue.

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