Q26 / 160 · AP EAMCET 2019 (22 Apr Shift 1) · Chemistry

Which one of the following statements is not correct regarding phosphine?

  • A
    It is a weak base
  • Correct answer
    B
    It reacts with \(\mathrm{CuSO}_4\) solution to form \(\mathrm{CuHPO}_4\)
  • C
    It is formed by the reaction of \(\mathrm{Ca}_3 \mathrm{P}_2\) with \(\mathrm{HCl}\)
  • D
    It is used in smoke screeens

Solution

Phosphine gives a black precipitate of cupric phosphide, when passed through \(\mathrm{CuSO}_4\) solution. \(3 \mathrm{CuSO}_4+2 \mathrm{PH}_3 \longrightarrow \mathrm{Cu}_3 \mathrm{P}_2+3 \mathrm{H}_2 \mathrm{SO}_4\) \(\mathrm{PH}_3\) is a weak base. It is prepared by as follows : \(\mathrm{Ca}_3 \mathrm{P}_2+6 \mathrm{HCl} \longrightarrow 2 \mathrm{PH}_3+3 \mathrm{CaCl}_2\) \(\mathrm{PH}_3\) is used in smoke screens. Hence, option (b) is incorrect. While other options are correct.

Hence, the correct answer is option: 'B'.

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