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Q.

The solubility product of barium chromate is 2.4 × 10–10. The maximum concentrations of barium nitrate possible with out precipitation in a 6 × 10–4 molar potassium chromate solution is

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a

\large 4 \times {10^{ - 7}}\,M

b

1.2 \times {10^{10}}\,M                                  

c

6 \times {10^{ - 4}}\,M

d

3 \times {10^{ - 4}}\,M

answer is A.

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Detailed Solution

Precipitation will only occur when the ionic product exceeds its Ksp.

\large \left[ {B{a^{ + 2}}} \right] \times \left[ {CrO_4^{ - 2}} \right] = 2.4 \times {10^{ - 10}}

\large \Rightarrow \left[ {B{a^{ + 2}}} \right] = \frac{{2.4 \times {{10}^{ - 10}}}}{{6 \times {{10}^{ - 4}}}} = 4 \times {10^{ - 17}}

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