What may be expected to happen when phosphine gas is mixed with chlorine gas?

  • A
    The mixture only cools down
  • B
    $PCl_3$ and $HCl$ are formed and the mixture warms up
  • C
    $PCl_5$ and $HCl$ are formed and the mixture warms up
  • D
    $PH_3 \cdot Cl_2$ is formed with warming up

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