Q. A white substance having alkaline nature in solution is

2068 219 AMUAMU 2004 Report Error

A

$N a N O_{3}$

B

$N H_{4} Cl$

C

$N a_{2} C O_{3}$

D

$F e C l_{3}$

Solution:

The salt of weak acid and strong base on hydrolysis gives alkaline solution.
$N a N O_{3}$ On hydrolysis gives neutral solution, as solution contains both strong acid and strong base.
$N a N O_{3} + H_{2} O ⟶ strong base N a O H + strong acid H N O_{3}$
$N H_{4} Cl$ On hydrolysis gives acidic solution as the solution contains strong acid and weak base.
$N H_{4} Cl + H_{2} O ⟶ weak base N H_{4} O H + strong acid H Cl$
$N a_{2} C O_{3}$ On hydrolysis gives alkaline solution as the solution contains strong base and weak acid.
$N a_{2} C O_{3} + 2 H_{2} O ⟶ strong base 2 N a O H + weak acid H_{2} C O_{3}$
$F e C l_{3}$ On hydrolysis gives acidic solution as the solution contain strong acid and weak base.
$F e C l_{3} + 3 H_{2} O ⟶ weak base F e (O H)_{3} + strongacid 3 H Cl$