Which one is not a correct mathematical equation for Dalton's Law of partial pressure? Here $p =$ total pressure of the gaseous mixture.

• A
  $p = n_{1} \frac{RT}{V} + n_{2} \frac{RT}{V} + n_{3} \frac{RT}{V}$
• B
  $p_{i} = \chi_{i} p$,where $p_{i} =$ partial pressure of $i^{\text{th}}$ gas and $\chi_{i} =$ mole fraction of $i^{\text{th}}$ gas in the gaseous mixture.
• C
  $p_{i} = \chi_{i} p_{i}^{0}$,where $\chi_{i} =$ mole fraction of $i^{\text{th}}$ gas in the gaseous mixture and $p_{i}^{0} =$ pressure of $i^{\text{th}}$ gas in the pure state.
• D
  $p = p_{1} + p_{2} + p_{3}$