Which of the following compounds is $NOT$ present in its standard state at $25^{\circ} C$ and $1 \text{ atmosphere}$ pressure?

  • A
    $CO_{2(g)}$
  • B
    $CaCO_{3(s)}$
  • C
    $C_{2}H_{5}OH_{(l)}$
  • D
    $H_{2}O_{(g)}$

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