Removal of calcium from freshly collected blood will

Prevent clotting

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Result in clotting

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Prevent oxidation of haemoglobin

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Cause haemolysis

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Solution

The correct option is A Prevent clotting
Clotting requires calcium ions ( $C a 2^{+}$ ), which is why blood banks use a chelating agent to bind the calcium in donated blood, so the blood will not clot in the bag.

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