An aqueous solution of A gives yellow ppt with $K_{2} {C r O}_{4}$

A may contain :

{P b}^{2 +} o r {A g}^{+} o r {B a}^{2 +}

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{P b}^{2 +} o r {B a}^{2 +}

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{A g}^{+} o r {B a}^{2 +}

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{P b}^{2 +} o r {A g}^{+}

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Solution

The correct option is B ${P b}^{2 +} o r {B a}^{2 +}$
Aqueous solution of A gives yellow ppt with $K_{2} {C r O}_{4}$ . A may contain ${P b}^{2 +} o r {B a}^{2 +}$ .

${P b}^{2 +} o r {B a}^{2 +}$ react with $K_{2} {C r O}_{4}$ to form yellow ppt of lead chromate or barium chromate respectively.

${P b}^{2 +} + K_{2} {C r O}_{4} \to P b {C r O}_{4} + 2 K^{+}$

${B a}^{2 +} + K_{2} {C r O}_{4} \to B a {C r O}_{4} + 2 K^{+}$

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