Paper: CSIR-NET June 2015 · Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry – General · Marks: 2 · Difficulty: Medium
Differential pulse polarography (DPP) is more sensitive than D.C. Polarography (DCP). Consider following reasons for it: 1. Non-faradic current is less in DPP in comparison to DCP 2. Non-faradic current is more in DPP in comparison to DCP 3. Polarogram of DPP is of different shape than that of DCP Correct reason(s) is/are:
(a)1 and 3
(b)2 and 3
(c)2 only
(d)1 only
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
DPP samples the current after the charging (non-faradaic) current has decayed, so only reason 1 is correct; the differing shape of the polarogram is not a reason for sensitivity.