Which element is located at the centre of the porphyrin ring in chlorophyll?

Calcium

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Magnesium

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Potassium

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Mangnese

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Solution

The correct option is B Magnesium
The chlorophyll molecule comprises of a cyclic tetrapyrrole porphyrin head and a long phytol tail. One atom of magnesium is coordinated to the centre of the tetrapyrrole head.

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m (m << M)

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v = \sqrt{(p - \sqrt{q}) \frac{G M}{R}}

(p + q)

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