Which of the following ions of heavy metals participate in process of photosynthesis in higher plants?

Pb, Fe, Ni, Co

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Mg, Zn, Cu, Hg

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Mg, Mn, Co, Fe

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Mg, Cu, Mn, Fe

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Solution

The correct option is C Mg, Cu, Mn, Fe
Magnesium is an important constituent of chlorophyll, manganese is required for photolysis of water and copper and iron are important for proteins like plastocyanin and iron sulphur proteins that are important participants of light reaction of photosynthesis.

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C u^{2 +}, N i^{2 +}, C o^{2 +}, F e^{2 +}

M n^{2 +}

T i^{3 +}, C u^{+}, N i^{2 +}, F e^{3 +}, M n^{2 +}, C o^{2 +}

M^{2 +}

Z n^{2 +} > S c^{2 +} = C u^{2 +} > T i^{2 +} = N i^{2 +} > V^{2 +} = C o^{2 +} > C r^{2 +} = F e^{2 +} > M n^{2 +}

For the four successive transition elements (Cr, Mn, Fe and Co), what is the order of stability of their +2 states?

(At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

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