$A$ solution,when diluted with $H_2O$ and boiled,gives a white precipitate. On the addition of excess $NH_4Cl / NH_4OH$,the volume of the precipitate decreases,leaving behind a white gelatinous precipitate. Identify the precipitate which dissolves in $NH_4OH / NH_4Cl$.
- A$Zn(OH)_2$
- B$Al(OH)_3$
- C$Mg(OH)_2$
- D$Ca(OH)_2$
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