Question

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60-points​

Answer 1

Q. A colourless compound gives a precipitate with AgNO3 solution but no precipitate with a solution of Na2CO3. The action of the concentrated H2SO4 on compound liberates a suffocating reddish brown gas. This compound is:-

Ans :-

Compound :- $NaBr$

Option →D

Explanation:-

Hint 1:-

As we know Silver bromide is a precipitate which is formed by the reaction of :-

$AgNO_3 + NaBr \rightarrow AgCl + NaNO_3$

Hint 2:-

It's form no precipitate with Solution of $Na_2CO_3$

Yes, it's right

$AgNO_3 + Na_2CO_3\rightarrow NaNO_3+ Ag_2CO_3$

Hint 3:-

The action of concentrated $H_2SO_4$

Bromine is a reddish brown gas and when sulphuric acid oxidise Bromine in this reaction.

$NaBr + H_2SO_4 \rightarrow Na_2SO_4 + SO_2 + H_2O + Br\uparrow$

All hints show that the compound must be NaBr.

Hence, the compound is NaBr.

Answer 2

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