A salt $M$ on treatment which concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia.

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Solution

The anion present is $C l^{-}$ . When $N a C l$ is added to the conc. $H_{2} S O_{4}$ solution and the solution is heated a colourless gas is evolved i.e. $H C l$ . When a glass rod dipped in ammonia is brought near this vessel, dense white fumes are obtained due to the formation of $N H_{4} C l$ . This is a confirmatory test for $C l^{-}$ ion.

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	Column A	Column B
1.	A substance that turns moist starch iodide paper blue.	A. Ammonium sulphate
2.	A compound which releases a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings.	B. Lead carbonate
3.	A solution of this compound gives a dirty green precipitate with sodium hydroxide.	C. Chlorine
4.	A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride.	D. Copper nitrate
5.	A white solid which gives a yellow residue on heating.	E. Ferrous sulphate.

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