Assertion :Zinc, manganese, cobalt and nickel ions present in 4th group is having same oxidation group. Reason: d-block metals having lower oxidation states have higher $K_{s p}$ .

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
$Z i n c, M a n g a n e s e, C o b a l t$ and $N i c k e l$ ions present in fourth group is having same oxidation state of $+ 2$ .
They are present as $Z n^{+ 2}, N i^{+ 2}, C O^{+ 2}$ and $M n^{+ 2} .$
d-block metals having lower oxidation states have less solubility product.

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Assertion :Zinc, manganese, cobalt and nickel ions present in 4th group is having same oxidation group. Reason: d-block metals having lower oxidation states have higher Ksp.

The correct option is C Assertion is correct but Reason is incorrect.Zinc,Manganese,Cobalt and Nickel ions present in fourth group is having same oxidation state of +2.They are present as Zn+2,Ni+2,CO+2 and Mn+2.d-block metals having lower oxidation states have less solubility product.

Assertion :Zinc, manganese, cobalt and nickel ions present in 4th group is having same oxidation group. Reason: d-block metals having lower oxidation states have higher $K_{s p}$ .