First slide

Alkaline earth metals

Question

Which is used to produce smoke screens?

Moderate

A

Zinc sulphide
B

Calcium phosphide
C

Zinc phosphide
D

Sodium carbonate

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 phosphide
Ca₃P₂ + 6H₂O → 3Ca(OH)₂+ 2PH₃

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