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Question

The following is known as "bordeaux mixture":

A
Borax and copper sulphate
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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.

Bordeaux mixture is complex and the reaction is:

CuSO4 Copper sulphate+Ca(OH)2 slaked lime=Cu(OH)2+CaSO4 Bordeaux mixture

Hence the correct answer is option (D)

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