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

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
Clotting requires calcium and sodium oxalate removes calcium ions (Ca $^{2 +}$ ) from blood plasma. So when sodium oxalate is added to a test tube it can prevent blood clotting.

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

The correct option is A sodium oxalateClotting requires calcium and sodium oxalate removes calcium ions (Ca2+) from blood plasma. So when sodium oxalate is added to a test tube it can prevent blood clotting.

The correct option is A sodium oxalate
Clotting requires calcium and sodium oxalate removes calcium ions (Ca $^{2 +}$ ) from blood plasma. So when sodium oxalate is added to a test tube it can prevent blood clotting.