Question

Which of the following is dissolved in water for making Bordeaux mixture?

(a) calcium chloride 

(b) copper sulphate

(c) sodium chloride 

(d) none of these

Answer 1

Option (b) copper sulphate.

Bordeaux mixture is a mixture of copper sulphate and calcium hydroxide dissolved in water.

Answer 2

Correct option (b) copper sulphate

Explanation :

The first pesticide which was discovered by Millardet in 1882 is as Bordeaux mixture. In 1878 Millardet of the university, of Bordeaux, France, found that downy mildew of grape-vine orchards was absent in areas where the plants were sprayed with copper sulphate alone or mixed with lime to prevent pilferage.