Given below are two statements: 1M aqueous solutions of each of Cu(NO3)2, AgNO3, Hg2(NO3)2 ; Mg(NO3)2 are electrolysed using inert electrodes. Given : V . E0 Ag / Ag , V . E0 Hg / Hg2 , V . E0 Cu / Cu

Question

Given below are two statements: 1M aqueous solutions of each of Cu(NO3)2, AgNO3, Hg2(NO3)2 ; Mg(NO3)2 are electrolysed using inert electrodes. Given : V . E0 Ag / Ag , V . E0 Hg / Hg2 , V . E0 Cu / Cu2 and V . E0 Mg / Mg2 . Statement (I): With increasing voltage, the sequence of deposition of metals on the cathode will be ag, Hg and Cu. Statement (II): Magnesium will not be deposited at cathode instead oxygen gas will be evolved at the cathode. In the light of the above statements, choose the most appropriate answer from the options given below :

(A) Both Statement-I and Statement-II are incorrect
(B) Statement-I is incorrect but Statement-II is correct
(C) Both Statement-I and Statement-II are correct
(D) Statement-I is correct but Statement-II is incorrect

Prashant Kotian · Accepted Answer

Correct answer: D. Statement II At cathode instead of Mg, H2O(l) with reduce & evolve H2 gas.

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