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Coordination Compounds — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
MCQ
Co$-$ordination compounds have great importance in biological systems. In this context which of the
following statements is incorrect?
  • ✓
    Chlorophylls are green pigments in plants and contain calcium.
  • B
    Haemoglobin is the red pigments of blood and contains iron.
  • C
    Cyanocobalamin is vitamin $B_{12}$ and contains cobalt.
  • D
    Carboxypeptidase$-A$ is an enzyme and contains zinc.
✓

Answer

Correct option: A.
Chlorophylls are green pigments in plants and contain calcium.
Chlorophyll is the green pigment in plants that helps in photosynthesis. The metal inside the ring structure of chlorophyll is magnesium $(\mathrm{Mg}^{2+}).$
The four nitrogen atoms in the ring structure of chlorophyll are bonded to the magnesium ion.

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