Assertion :The anode of copper voltmeter has to be copper only. Reason: The equivalent amount of copper from anode has to be dissolved into the electrolyte to preserve the concentration.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
When current is passed through copper voltmeter, $C u S O_{4}$ (electrolyte) dissociated into $C u^{+ +}$ and $S O_{4}^{- -}$ ions. $C u^{+ +}$ ions drift towards the cathode and after taking two electrons from the cathode become Cu atom and is deposited on the cathode. $S O_{4}^{- -}$ ions move towards the anode and react with $C u^{+ +}$ ions to form $C u S O_{4}$ . $C u S O_{4}$ so formed is dissolved in the solution to preserve the concentration of $C u S O_{4}$ . This is possible only if anode is made of copper.

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