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Potassium chromate is isomorphous to potassium sulphate $(K_{2} {S O}_{4})$ . It is found to contain $26.78 %$ chromium. Calculate the atomic mass of chromium(At.wt $K = 39.1$ )

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answer is B.

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Detailed Solution

Molecular formula of potassium chromate is $K_{2} {C r O}_{4}$

Let the weight of $C r$ be a

So, $K_{2} {C r O}_{4} = 39.1 \times 2 + a + 16 \times 4 = 142.2 + a$ .

Percentage of Cr in $K_{2} {C r O}_{4} = \frac{a}{142.2 + a} \times 100$ .

Percentage of Cr is = 26.78.

$∴ \frac{100 a}{142.2 + a} = 26.78$

a=52.0.

Therefore, option B is correct.

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