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MCQ on polarography: Page-1

Supporting electrolyte is used in polarography to suppress
Diffusion current

(A) P

(B) Q,S

(C) R,S

(D) Q

Polarography belongs to the group of electrochemical analysis of
Steady-state methods

(A) P

(B) Q

(C) R

(D) S

All of the following are the advantages of dropping mercury electrode, except

(A) Constant renewal of electrode surface which eliminates poisoning

(B) Mercury forms amalgams with many metals and thus decreases their reduction potentials

(C) Useful for detection of ionic species less than 0.001 M

(D) Diffusion current assumes steady state immediately

Maxima in polarographic curve is observed due to
Migration current

(A) P

(B) Q

(C) R

(D) S

The drop life of mercury in dropping mercuric voltammetry is

(A) < 2 sec

(B) 2-5 sec

(C) 5-7 sec

(D) 5-10 sec