Q25 · CSIR NET Chemistry, December 2017
Paper: CSIR NET December 2017 · Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry – General · Marks: 2 · Difficulty: Easy
Spectrophotometric monitoring is not suitable to determine the end point of titration of:
(a)oxalic acid vs potassium permanganate
(b)iron(II) vs 1, 10-phenanthroline
(c)cobalt(II) vs Eriochrome black T
(d)nickel (II) vs dimethylglyoxime
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
Chapter key (c). Co(II) blocks Eriochrome Black T (the metal–indicator complex is too stable to release the dye), so no usable end-point colour change appears.
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