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COMEDK2014Chemistryp Block Elements (Group 15, 16, 17 & 18)

Solid A reacts with strong NaOH (a q) liberating a foul smelling gas B which spontaneously burn in air giving smoky rings. A and B are respectively.

Options

  1. Ap_ red and PH ₃
  2. Bp_ White and PH ₃
  3. CS and H ₂ ~S
  4. Dp_ white and H ₂ ~S

Correct answer

B. p_ White and PH ₃

Step-by-step solution

Phosphine has unpleasant odour like that of garlic or rotten fish. It burns in air to give clouds of P ₄ O ₁₀ which act as smoke screens.

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