Which of the following does not contain nitrogen?

Proteins in plants and animals

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Members of apatite family

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Indian saltpetre

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Chile saltpetre

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Solution

The correct option is C Members of apatite family
Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, with high concentrations of $O H^{-}, F -, C l -$ respectively, in the crystal. Proteins in plants and animals have nitrogen. Chile saltpetre and Indian saltpetre are $N a N O_{3}$ and $K N O_{3}$ respectively.

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