How many of the following salts are white and soluble in dilute ${HNO}_{3}$ ?
${BaCrO}_{4}, {Hg}_{2} {CrO}_{4}, ZnS, {BaSO}_{4}, {CH}_{3} COOAg, {AgNO}_{2}$

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answer is 3.

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Detailed Solution

BaCrO₄ - Yellow, soluble in dil HNO₃
Hg₂CrO₄- Red, soluble in conc.HNO₃
ZnS- White, soluble in conc.HNO₃
BsSO₄- White, insoluble in all mineral acids
CH₃COOAg and AgNO₂ all are white solid
and are soluble in dilute HNO₃ solution

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