When aqueous sodium hydroxide is added to an aqueous solution of chromium (III) ions, a green blue precipitate is first formed which re-dissolves to give a green solution. This green colour is due to

Question

When aqueous sodium hydroxide is added to an aqueous solution of chromium (III) ions, a green blue precipitate is first formed which re-dissolves to give a green solution. This green colour is due to :

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Bordeaux mixture is a highly effective fungicide widely used in agriculture to protect plants against molds and fungi. Step 2: It is prepared chemically by combining copper(II) sulfate (CuSO4) solution with slaked lime (calcium hydroxide). Step 3: Thus, a mixture of CuSO4 solution and lime is known as Bordeaux mixture, which corresponds to option (d).

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