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Q.

Formula of potassium dichromate

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a

K_{2} C r_{2} O_{7}

b

K_{2} C r O_{7}

c

K C r_{2} O_{7}

d

K_{2} C r O_{4}

answer is B.

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Detailed Solution

The formula of potassium dichromate $K_{2} C r_{2} O_{7}$ . The dichromate ion has a valency of 2 and potassium has a valency of 1.

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