Question

Which is used to produce smoke screens?

A

Zinc sulphide

B

Calcium phosphide

C

Zinc phosphide

D

Sodium carbonate

Medium

Solution

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Correct option is
B

Calcium phosphide

is formed there along with acetylene under the reaction of with where , the phosphene reacts with acetylene formed and catches fire to get smoke which forms the smoke screen.

In Holme's singal , the calcium phosphide and calcium carbide is thrown in sea where the reaction produces phosphene  gas and acetylene and the phosphene catches fire with acetylene and forms smoke which sends the signal 

+

+ +  

forms white dense smoke screen.

Solve any question of The p-Block Elements with:-

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