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Nitric Acid

A mixture of ...

Question

A mixture of two salts is not water soluble but dissolves completely in dil. $H C l$ to form a colourless solution. The mixture could be :

A g N O_{3}

and

K B r

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B a C O_{3}

and

Z n S

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F e C l_{3}

and

C a C O_{3}

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M n (N O_{3})_{2}

and

M g S O_{4}

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Solution

The correct option is C $B a C O_{3}$ and $Z n S$
Only ${B a C O}_{3}$ and $Z n S$ are insoluble in water but on reaction with $C h l . H C l$ they from chloride which are colourless
$Z n S + 2 H C l \to {Z n C l}_{2} + H_{2} S$
soluble
${B a C O}_{3} + 2 H C l \to {B a C l}_{2} + H_{2} {C O}_{3}$
soluble.

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