Which one of the following ions is essential for photolysis of water ?

Manganese

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Zinc

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Copper

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Boron

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Solution

The correct option is A Manganese
The phenomenon of breaking up of water into hydrogen and oxygen in the illuminated chloroplasts is called photolysis or photocatalytic splitting of water. It can be depicted as: $4 H_{2} O ⇌ 4 H^{+} + 4 O H^{-}$
$4 O H^{-} O x y g e n e v o l v i n g c o m p l e x - --------------- \to M n^{2} +, C a^{2} +, C I^{-} 2 H_{2} O + O_{2} ↑ + 4 e^{-}$
So, the correct answer is 'Manganese'

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Assertion: Protons or hydrogen ions produced by photolysis of water accumulate in the lumen of thylakoids.
Reason: Photolysis of water takes place in the inner membrane of thylakoids.

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