Haemocyanin, the blue colouring pigment of molluscan blood contains

Iron

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Magnesium

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Copper

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Manganese

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Solution

The correct option is C Copper
Hemocyanins is the pigment of blood in Mollusca. It is a copper-containing protein in the blood of the large crustaceans and molluscs. It is a colourless pigment in the deoxygenated state and turns into blue when exposed to the air or oxygen dissolved into the blood.
Therefore, the correct answer is option C.

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