Question:

The material used in warfare in making smoke screens for military purposes is:

Updated On: Aug 15, 2022
  • $ P{{H}_{3}} $
  • $ PC{{l}_{5}} $
  • $ SiC{{l}_{4}} $
  • $ N{{H}_{3}} $
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The Correct Option is A

Solution and Explanation

Phosphine $\left( PH _{3}\right)$ when comes in contact with air, to forms vortex rings of $P _{2} O _{5}$ in the forms of white smoke. Hence, it is used to prepare smoke screen in warfare.
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Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: