On treating a salt with conc. Sulphuric acid \( \mathrm{P} \) follo...

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On treating a salt with conc. Sulphuric acid
\( \mathrm{P} \)
following observation has occurred-
W
A colourless gas with pungent smell, which gives dense white fumes when a rod dipped in ammonium hydroxide is brought near the mouth of the test tube. The present anion in it is-
(1) Carbonate
(2) Sulphate
(3) Chloride
(4) Iodide
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