Assertion :At the end of electrolysis using platinum electrodes, an aqueous solution of $C u S O_{4}$ turns colourless. Reason: During the electrolysis $C u S O_{4}$ changes to $C u (O H)_{2}$ during electrolysis.

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
Assertion:
At the end of electrolysis using platinum electrodes, an aqueous solution of $C u S O_{4}$
turns colourless because $C u (I I)$ ions are reduced to $C u$ .
$C u^{2 +} + 2 e^{-} \to C u$
Reason:
During the electrolysis $C u S O$ $_{4}$ changes to $C u$ metal during electrolysis.
Hence, Assertion is correct but Reason is incorrect.

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Similar questions

Q. Assertion :At the end of electrolysis using Pt electrodes, an aqueous solution of

C u S O_{4}

turns colorless. Reason:

C u S O_{4}

changes to

C u (O H)_{2}

during elctrolysis.

Q. Assertion :Aqueous solution of

C u S O_{4}

turns colourless on complete electrolysis using platinum electrode. Reason:

C u S O_{4}

is converted into

C u (O H)_{2}

on electrolysis.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

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Assertion :At the end of electrolysis using platinum electrodes, an aqueous solution of CuSO4 turns colourless. Reason: During the electrolysis CuSO4 changes to Cu(OH)2 during electrolysis.

Assertion :At the end of electrolysis using platinum electrodes, an aqueous solution of $C u S O_{4}$ turns colourless. Reason: During the electrolysis $C u S O_{4}$ changes to $C u (O H)_{2}$ during electrolysis.