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General Rules of Electrolysis

which product...

Question

which product is formed at cathode anode during electrolysis of aq. cuso₄ with inert electrode platinum.

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Solution

When the electrolysis of aqueous solution of copper sulphate is carried out , the positively charged Cu2+ ions migrate to cathode and the reduction takes place as follows :
Cu²⁺ + 2e^- → Cu
Thus Cu gets deposited at cathode.

At anode oxidation takes place .
H₂O → 1/2O₂ + 2H⁺ + 2e^-
i.e oxygen gas is liberated.

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Q. State the reason for a difference in the product formed at the anode during electrolysis of aq.

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solution using platinum anode.

Q. On electrolysis of aqueous sodium sulphate using platinum electrodes, the product formed at cathode and anode are respectively:

Q. Which of the following will give

H_{2} (g)

O_{2} (g)

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at anode:

C u^{+ 2} + 2 e^{-} \to C u

C u \to C u^{+ 2} + 2 e^{-}

Reason: Oxidation always take place at anode and reduction at cathode.

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