Q.

Which is used to produce smoke screens?

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a

Zinc sulphide

b

Calcium phosphide

c

Zinc phosphide

d

Sodium carbonate

answer is B.

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Detailed Solution

Smoke screen is a mass of dense artificial smoke used to conceal military areas or operations from an enemy. It is produced by calcium phosphideCa3​P2​ + 6H2​O → 3Ca(OH)2 ​+ 2PH3
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