1.

a colourless solution of compound A gives white precipitate

Answer» Aluminum bromide (A) reacts with sodium hydroxide to give a white precipitate of aluminum hydroxide.

AlBr  

3

​  

+3NaOH→  

whiteppt

Al(OH)  

3

​  



​  

+3NaBr

The precipitate dissolves in excess of NaOH to form sodium meta aluminate which is (C).

Al(OH)  

3

​  

+NaOH→  

sodiummetaaluminate

Na[AlO  

2

​  

]

​  

+2H  

2

​  

O

Sodium meta aluminate does not give precipitate with hydrogen sulphide.

When sodium meta aluminate is boiled with ammonium chloride, the precipitate of aluminum hydroxide is formed.

Aluminum  bromide reacts with silver nitrate to form yellow precipitate of silver bromide.

AlBr  

3

​  

+3AgNO  

3

​  

→  

yellowprecipitate

3AgBr

​  

+Al(NO  

3

​  

)  

3


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