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  4. A white substance having alkaline nature in solution is

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Q. A white substance having alkaline nature in solution is

AMUAMU 2004

Solution:

The salt of weak acid and strong base on hydrolysis gives alkaline solution.
$NaNO _{3}$ On hydrolysis gives neutral solution, as solution contains both strong acid and strong base.
$NaNO _{3}+ H _{2} O \longrightarrow \underset{\text { strong base }}{ NaOH }+\underset{\text{strong acid}}{HNO _{3}}$
$NH _{4} Cl$ On hydrolysis gives acidic solution as the solution contains strong acid and weak base.
$NH_4Cl +H_2O \longrightarrow \underset{\text{weak base}}{NH_4OH} +\underset{\text{strong acid}}{HCl}$
$Na _{2} CO _{3}$ On hydrolysis gives alkaline solution as the solution contains strong base and weak acid.
$Na_2CO_3 +2H_2O \longrightarrow \underset{\text{strong base}}{2NaOH} +\underset{\text{weak acid}}{H_2CO_3}$
$FeCl _{3}$ On hydrolysis gives acidic solution as the solution contain strong acid and weak base.
$FeCl _{3}+3 H _{2} O \longrightarrow \underset{\text{weak base}}{Fe(OH)_3} + \underset{\text{strongacid}}{3HCl}$