A : Equivalent weight of Cu in CuO is 63.6 and in Cu2O is 31.8.R : Equivalent weight of an element = Atomic weight of an element Valency of the element

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A : Equivalent weight of $C u$ in $C u O$ is $63.6$ and in ${C u}_{2} O$ is $31.8$ .
R : Equivalent weight of an element $= \frac{Atomic weight of an element}{Valency of the element}$

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Both $A$ and $R$ are true and $R$ is not the correct explanation

$A$ is false but $R$ is true

A is true but $R$ is false

Both $A$ and $R$ are true and $R$ is the correct explanation

answer is D.

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In $C u O$ ,

Equivalent weight of $C u = 63.6 / 2 = 31.8$

In ${C u}_{2} O$

Equivalent weight of $C u = 63.6 / 1 = 63.6$

Thus, the assertion is incorrect and the reason is correct. Hence, option (D) is correct.

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