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The gas law  constant is true for

  1. isothermal change only
  2. adiabatic change only
  3. both isothermal and adiabatic changes
  4. neither isothermal nor adiabatic changes

Answer (Detailed Solution Below)

Option 3 : both isothermal and adiabatic changes
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Detailed Solution

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CONCEPT:

  • Ideal gas law is obeyed by all hypothetical ideal gases but presents a good approximation of the behavior of many real gases as well.
  • It states that the product of pressure P and volume V of an ideal gas is proportional to its temperature T.

EXPLANATION:

  • The law includes all the kinds of processes and changes the gas may undergo and is therefore valid for both isothermal and adiabatic changes. Therefore, option 3 is correct. 

Additional Information

Isothermal process Adiabatic process
For an isothermal process, the temperature of a gas is maintained constant by exchanging heat with the surrounding. The temperature of the gas is a variable for an adiabatic process and no heat is exchanged with the surrounding.

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