Q42 / 180 · AIIMS 2013 · Chemistry

Assertion : For an isolated system, $q$ is zero. Reason : In an isolated system, change in $U$ and $V$ is zero.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

For an isolated system, $W=q=0$ $\Delta U=q+W$ Hence, $\Delta U=0$ $W=P \Delta V$ as $W=0 \mathrm{so}, \Delta V=0$

Hence, the correct answer is option: 'B'.

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