Q64 / 180 · AIIMS 2008 · Chemistry

Assertion : When a concentrated solution is diluted by adding more water, molarity of the solution remains unchanged. Reason : Product of moles of a solute and volume is equal to the molarity.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • 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.
  • Correct answer
    D
    If both assertion and reason are false.

Solution

Molarity equation is written as $M_1 V_1=M_2 V_2$ thus if the $V_2$ changes $M_2$ also changes. Molarity $=\frac{\text { moles of solute }}{\text { volume of solution in litre }}$

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

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