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Q.

When very dilute solution of sodium hydroxide is electrolysed using platinum electrodes, then

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a

hydrogen is evolved at cathode

b

hydrogen is evolved at anode

c

sodium is obtained at cathode

d

oxygen is produced at anode

answer is A.

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Detailed Solution

NaOH⟶Na++OH−At anode - 2H2O⟶O2+4H++4e−At cathode - H++e−⟶12H2
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