MHT CET Chemistry question

Which of the following reactions cannot be a base for electrochemical cell?

(A)
(B)AgNO_3 + Zn \longrightarrow Zn(NO_3)_2 + Ag
(C)AgNO_3 + NaCl \longrightarrow AgCl\downarrow + NaNO_3Correct
(D)KMnO_4 + FeSO_4 + H_2SO_4 \longrightarrow K_2SO_4 + Fe_2(SO_4)_3 + MnSO_4 + H_2O

Answer: (C)

Solution

An electrochemical cell needs a redox reaction; (a), (b) and (d) involve changes in oxidation number (H2/O2, Zn/Ag+, Mn7+/Fe2+),

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Question ID VK-066963