Aqueous $AgNO X_{3}$ is electrolysed. Which of the following statements are correct?

AWith platinum electrodes, $O X_{2}$ is evolved at the anode and the solution becomes acidic
BWith silver electrodes, the anode dissolves and the concentration of $AgNO X_{3}$ remains practically constant
CWith platinum electrodes, $H X_{2}$ is liberated at the cathode in preference to silver
DWith platinum electrodes, the concentration of $Ag X^{+}$ in the solution decreases with time

Answer: A, B, D

Ag X^{+}

(

E^{\circ} = + 0.80 V

) is reduced far more easily than water, so silver, not hydrogen, is deposited at the cathode in every case; (C) is wrong. With inert Pt anode, water is oxidised:

2 H X_{2} O O X_{2} + 4 H X^{+} + 4 e X^{-}

, the solution turns acidic and

Ag X^{+}

is removed from solution, so (A) and (D) are correct. With a silver anode the lowest-potential anodic process is

Ag Ag X^{+} + e X^{-}

, which replaces exactly the

Ag X^{+}

removed at the cathode, so (B) is correct.

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Aqueous AgNOX3​ is electrolysed. Which of the following statements are correct?

Answer: A, B, D

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Aqueous $AgNO X_{3}$ is electrolysed. Which of the following statements are correct?