A) Iron
B) Cobalt
C) Magnesium
D) Chromium
Correct Answer: C
Solution :
(i) Iron: It is found in haemoglobin. (ii) Cobalt: It is found in vitamin 85. (iii) Magnesium: It is found in chlorophyll. (iv) Chromium is used in chrome plating and stainless steel.
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