In an isochoric process if ${T_1} = {27^o}C$ and ${T_2} = {127^o}C,$ then ${P_1}/{P_2}$ will be equal to
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(d) At constant volume $P \propto T$==> $\frac{{{P_1}}}{{{P_2}}} = \frac{{{T_1}}}{{{T_2}}}$
==>$\frac{{{P_1}}}{{{P_2}}} = \frac{{300}}{{400}} = \frac{3}{4}$
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