What would you observe if excess of diute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?
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a
A permanent white precipitate is formed immediately
b
No change at first but a white precipitate is formed on standing
c
A white precipitate is formed which later dissolves
d
A green precipitate which turns red on standing in air
answer is C.
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Detailed Solution
When excess of dilute NaOH solution is added and shaken with an aqueous solution of AlCl3,initially a white precipitate Al(OH)3 is formed which dissolves later due to the formation of sodium meta aluminate complex.