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PV = nRT is ideal gas equation

$\frac{P_{1} V_{1}}{T_{1}} = \frac{P_{2} V_{2}}{T_{2}}$ is combined gas equation

R is universal gas constant

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answer is D.

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All the given statements are correct as per the gas laws:

PV = nRT: This is the Ideal Gas Law, which relates pressure (P), volume (V), amount of gas (n), the gas constant (R), and temperature (T) in absolute units. It is the fundamental equation describing the behavior of an ideal gas.
Combined Gas Equation: The equation ^P_¹^V_¹/_T1 = ^P_²^V_²/_T2 is derived from Boyle's, Charles's, and Gay-Lussac's laws. It helps predict the behavior of a gas when two or more properties change simultaneously.
Universal Gas Constant (R): This is a proportionality constant used in the ideal gas equation. Its value remains the same for all gases and is expressed as approximately 8.314 J/(mol·K).