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B
Orthoboric acid and ferrous sulphate
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C
Sodium borate and zinc sulphate
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D
Copper sulphate and slaked lime
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Solution
The correct option is C Copper sulphate and slaked lime
Bordeaux mixture (also called Bordo Mix) is a mixture of copper sulphate (CuSO4) and slaked lime (Ca(OH)2) used as a fungicide. It is used in vineyards, fruit-farms, and gardens to prevent infestations of downy mildew, powdery mildew, and other fungi.