When copper rod donates electrons to hydrogen ions, it gains ______ charge.

positive

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negative

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no charge

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can't say

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Solution

The correct option is A positive
When an electrode donates electron it suffers a loss of the electron and hence it becomes positively charged.
$C u \to C u^{+} + e^{-}$

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Reduction is the process in which an atom (or ion) donates an electron or hydrogen ion reducing its oxidation number.

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