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Standard X

Chemistry

Covalent Bond

The aqueous s...

Question

The aqueous solution of inorganic compound $(X)$ yielded a white precipitate when treated with dilute $H N O_{3}$ and $A g N O_{3}$ . Another sample of the solution of $(X)$ when treated with $N a O H$ gave a white precipitate first which dissolved in excess of $N a O H$ yielding a colorless solution. When $H_{2} S$ gas was passed through that solution a white precipitate was obtained.

Identify the compound $(X)$ and give the reactions.

Z n C l_{2}

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A l C l_{3}

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B a C l_{2}

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N a C l

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Solution

The correct option is A $Z n C l_{2}$

Upon reaction with dil $H N O_{3}$ and $A g N O_{3}$ , X yielded a white precipitate. This indicates the presence of Chloride ion in X (see the reaction (i)).

When X was treated with NaOH, it gave a white precipitate. Since hydroxides of Na and Ba are soluble they won't form a precipitate, indicating C and D as wrong options. Whereas, hydroxides of both Zn and Al form a white precipitate, which dissolved in excess of NaOH yielding a colourless solution (see reactions (ii)).

On treatment with $H_{2} S$ , a white precipitate was obtained. This indicates the presence of Zn ion in X (see the reaction

(iii)). Thus the answer is option A, ZnCl $_{2}$ .

Hence, the correct option is $A$

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