Question

$A{l}_2(S{O}_4{)}_3+N{H}_{4}OH\to X$, then $X$ is :

• A. a white coloured compound
• B. insoluble in excess of $N{H}_{4}OH$
• C. soluble in NaOH
• D. cannot be used as an antacid

Answer 1

Answer: (A), (B), (C)

The correct options are
A soluble in NaOH
B a white coloured compound
C insoluble in excess of $N{H}_{4}OH$

$A{l}_2(S{O}_4{)}_3+6N{H}_{4}OH\to 2Al(OH{)}_3+3(N{H}_4{)}_{2}S{O}_4$
$X$ is $Al(OH{)}_3$ which is white gelatinous precpitate soluble in strong alkalis like $NaOH$ and insoluble in excess of $N{H}_{4}OH$.
$Al(OH{)}_3+NaOH\to Na[Al\left(OH{)}_4\right]$