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Bordeaux mixture, a well-known fungicide, is prepared by combining which two substances?

1. CaSO4 + Cu(OH)2
2. CuSO4 + Ca(OH)2
3. CuSO4 + CaO
4. CuO + CaO

Correct answer: CuSO4 + Ca(OH)2

Solution

Bordeaux mixture is made from copper sulphate and calcium hydroxide (slaked lime) in water.

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