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RBC

The hardness ...

Question

The hardness of the bone tissue is due to the phosphates and carbonates of _ and _.

A

Calcium and Sodium

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B

Calcium and Magnesium

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C

Magnesium and Sodium

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D

Magnesium and Potassium

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Solution

The correct option is B
Calcium and Magnesium

Bone is the main supportive structure of vertebrates. Bones support and protect the various organs of the body and produce red blood cells. The bone cells are embedded in a hard matrix that is composed of calcium and magnesium. Calcium and magnesium are the responsible for the hardness of the bone tissue.

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Q. Assertion (A): Hardness of water is removed by treatment with sodium carbonate.
Reason (R): Sodium carbonate reacts with soluble magnesium and calcium chloride to form water soluble compounds.

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(a) Sodium chloride, calcium chloride

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