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Question

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

A
AgNO3 and KBr
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B
BaCO3 and ZnS
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C
FeCl3 and CaCO3
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D
Mn(NO3)2 and MgSO4
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Solution

The correct option is C BaCO3 and ZnS
Only BaCO3 and ZnS are insoluble in water but on reaction with Chl.HCl they from chloride which are colourless
ZnS+2HClZnCl2+H2S
soluble
BaCO3+2HClBaCl2+H2CO3
soluble.

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