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Which expression is valid for an ideal g...

Which expression is valid for an ideal gas :

A

`PV = (RT)/n`

B

`V_1T_1 = V_2T_2`

C

`P_1V_2 = V_1P_2`

D

`P_1T_2d_2 = P_2T_1d_1`

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The correct Answer is:
D
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