Assertion :Oxidation state of 'H' is $+ 1$ in $C u H_{2}$ and is $- 1$ in $C a H_{2}$ . Reason: Ca is stronger electropositive than hydrogen.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Hydrogen is more electropositive than copper and less electropositive than calcium so oxidation state of hydrogen is $C u H_{2}$ is +1 and in $C a H_{2}$ is -1.

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Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

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