Question:medium

The mismatched combinations are
A. Chlorophyll - Co 
B. Water hardness - EDTA 
C. Photography - [Ag(CN)2]- 
D. Wilkinson catalyst - [(Ph3P)3 RhCl]  
E. Chelating ligand-D- Penicillamine

Updated On: Mar 25, 2026
  • A, C and E only
  • A and C only
  • A and E only
  • D and E only
Show Solution

The Correct Option is B

Solution and Explanation

To determine which combinations are mismatched, let's evaluate each option based on known chemical associations:

  1. Chlorophyll - Co:
    • Chlorophyll is a green pigment found in plants, essential for photosynthesis.
    • It contains a central metal ion, which is magnesium (\text{Mg}^{2+}), not cobalt (Co).
    • Thus, this is a mismatched combination.
  2. Water hardness - EDTA:
    • EDTA (Ethylenediaminetetraacetic acid) is commonly used in analytical chemistry to sequester metal ions, such as calcium and magnesium, which cause water hardness.
    • This combination is correct as EDTA is used to determine water hardness.
  3. Photography - [Ag(CN)2]-:
    • Photography traditionally involves silver halides like AgBr or AgCl. [Ag(CN)2]- is not typically associated with photography but with silver plating and electroplating processes.
    • This is a mismatched combination.
  4. Wilkinson catalyst - [(Ph3P)3RhCl]:
    • The Wilkinson catalyst is indeed [(Ph3P)3RhCl], used in hydrogenation reactions.
    • This combination is correct.
  5. Chelating ligand - D-Penicillamine:
    • D-Penicillamine is a known chelating agent used to remove excess metals from the body.
    • This combination is correct.

Based on the above analysis, the mismatched combinations are A. Chlorophyll - Co and C. Photography - [Ag(CN)2]-. Hence, the correct answer is A and C only.

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