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KCET2014Chemistryp Block Elements (Group 15, 16, 17 & 18)

The statement that is NOT correct is

Options

  1. AVan der Waals constant 'a' measures extent of intermolecular attractive forces for real gases.
  2. BBoyle point depends on the nature of real gas,
  3. CCompressibility factor measures the deviation of real gas from ideal behaviour.
  4. DCritical temperature is the lowest temperature at which liquefaction of a gas first occurs.

Correct answer

D. Critical temperature is the lowest temperature at which liquefaction of a gas first occurs.

Step-by-step solution

Critical temperature is not the lowest temperature at which liquefaction of a gas first occurs. The critical temperature of a substance is the temperature at and above which vapor of the substance cannot be liquefied no matter how much pressure is applied. Therefore, statement (4) is incorrect.

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