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Q.

To the small quatity of salt which consist of II^nd group anion taken in dry test tube, conc. $H_{2} {SO}_{4}$ is added, colourless gas with pungent smell is evolved which gives dense white fumes with glass rod dipped in $N H_{4} O H$ . The colourless gas is ?

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a

$C l_{2}$

b

$H C l$

c

$N O_{2}$

d

$B r_{2}$

answer is B.

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Detailed Solution

$N a C l + c o n . H_{2} S O_{4} \to N a_{2} S O_{4} + \underset{c o l o u r l e s s}{2 H C l ↑}$
$H C l + N H_{4} O H \to \underset{D e n s e w h i t e f u m e s}{N H_{4} C l}$
$C l_{2} -$ Greenish yellow
$N O_{2}, B r_{2} -$ Reddish brown
$H C l -$ Colourless

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To the small quatity of salt which consist of IInd group anion taken in dry test tube, conc. H2SO4 is added, colourless gas with pungent smell is evolved which gives dense white fumes with glass rod dipped in NH4OH. The colourless gas is ?