Q65 / 180 · AIIMS 2015 · Chemistry

Assertion: $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is used as primary standard in volumetric analysis. Reason : It has a good solubility in water.

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

Solution

$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is less soluble in water. It can be found in pure state and can be accurately weighed. It is not hygroscopic in nature. So, $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is used as a primary standard solution.

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

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