First slide

Sulphuric acid

Question

$2 N a Z + H_{2} S O_{4} (c o n c .) \overset{}{\to} N a_{2} S O_{4} + 2 H Z .$ Z cannot be

Moderate

A

$H C l$
B

$H F$
C

$H N O_{3}$
D

$H I$

Solution

$2 N a I + H_{2} S O_{4} (c o n c .) \overset{}{\to} 2 H I + N a_{2} S O_{4}$
$2 H I + H_{2} S O_{4} (c o n c .) \overset{}{\to} I_{2} + 2 H_{2} O + S O_{2}$
$C o n c . H_{2} S O_{4} o x i d i z e s H I t o I_{2}$

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