$100 \ mL$ of $PH_3$ when completely decomposed produces phosphorus and hydrogen. The change in volume of the gas is
$PH_{3(g)} \longrightarrow P_{(s)} + \frac{3}{2} H_{2(g)}$

  • A
    $50 \ mL$ increase
  • B
    $500 \ mL$ decrease
  • C
    $900 \ mL$ decrease
  • D
    nil

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