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Q.

When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain

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a

a white precipitate

b

bluish white precipitate

c

a clear solution

d

a crystalline mass

answer is C.

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Detailed Solution

Potash alum is K2SO4.Al2SO43.24H2O  Al2SO43 +  6NaOH  →  2AlOH3  ↓  white +  3Na2SO4; AlOH3  + OH-  → AlOH4-   soluble complex
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When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain