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AP EAMCET20225 Jul 2022Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The compound that is used in smoke screens is

Options

  1. AMg ₃ ~N ₂
  2. BMgO
  3. CNaN ₃
  4. DCa ₃ P ₂

Correct answer

D. Ca ₃ P ₂

Step-by-step solution

A smoke screen is a dense cloud of fake smoke used to hide military areas. Ca ₃ P ₂+6 H ₂ O 3 Ca ( OH )₂+2 PH ₃ PH ₃ spontaneously catches fire to produce P ₂ O ₅ : 2 PH ₃+4 O ₂ P ₂ O ₅+3 H ₂ O P ₂ O ₅ forms a white dense smoke screen.

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