For one mole of an ideal gas,the slope of $V$ vs. $T$ curve at a constant pressure of $2 \ atm$ is $X \ L \ mol^{-1} \ K^{-1}$. The value of the ideal universal gas constant '$R$' in terms of $X$ is

  • A
    $X \ L \ atm \ mol^{-1} \ K^{-1}$
  • B
    $\frac{X}{2} \ L \ atm \ mol^{-1} \ K^{-1}$
  • C
    $2 \times X \ L \ atm \ mol^{-1} \ K^{-1}$
  • D
    $2 \ X \ atm \ L \ mol^{-1} \ K^{-1}$

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