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  • A mixture of two salts is not water soluble but dissolves completely in dilute hydrochloric acid to form a colourless solution. The mixture could beOption: 1</st

A mixture of two salts is not water soluble but dissolves completely in dilute hydrochloric acid to form a colourless solution. The mixture could be

Option: 1

\mathrm{AgNO}_{3}\: \text{and}\: \mathrm{KBr}


Option: 2

\mathrm{BaCO}_{3}\: \text{and}\: \mathrm{ZnS}


Option: 3

\mathrm{FeCl}_{3} \: \text{and}\: \mathrm{CaCO}_{3}


Option: 4

\mathrm{Mn(NO_{3})_{2}\: \text{and} \: \mathrm{MgSO}_{4}}


Answers (1)

best_answer

Salts containing conjugate base of weaker acids will dissolve in \mathrm{HCl}.

Out of the given salts, \mathrm{BaCO_3} and \mathrm{ZnS} will dissolve in \mathrm{HCl}. The reactions are given below:

\begin{aligned} &\mathrm{BaCO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{BaCl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2} \\ &\mathrm{ZnS}+\underset{\text { (dil.) }}{2 \mathrm{HCl} \rightarrow \mathrm{ZnCl}_{2}+\mathrm{H}_{2} \mathrm{S}} \end{aligned}

Hence, the correct answer is Option (2)

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shivangi.shekhar

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