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Primary valency of binary compound ${CrCl}_{3}, {CoCl}_{2} and {PdCl}_{2}$ are

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3, 3 and 2 respectively

2, 3 and 2 respectively

3, 2 and 2 respectively

2, 2 and 3 respectively

answer is D.

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Detailed Solution

Primary valency corresponds to the oxidation state of metal. Thus, in the given binary compounds ${CrCl}_{3}, {CoCl}_{2} and {PdCl}_{2}$ , the primary valencies are 3, 2 and 2 respectively.

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