Blood clotting can be prevented in a test tube by adding a little

Sodium oxalate

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Sodium chloride

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Sodium hydroxide

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Ammonium chloride

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Solution

The correct option is A Sodium oxalate
Sodium oxalate acts as an anticoagulant. Sodium oxalate inhibits blood coagulation by forming an insoluble complex with calcium because calcium is a cofactor that involves in the clotting process. Hence, option A is the correct answer.

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