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Question: Answered & Verified by Expert
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.
Chemistryd and f Block ElementsAIIMSAIIMS 2006
Options:
  • A If both assertion and reason are true and reason is the correct explanation of the assertion
  • B If both assertion and reason are true but reason is not the correct explanation of the assertion
  • C If assertion is true, but reason is false
  • D Both assertion and reason are false statements.
Solution:
1381 Upvotes Verified Answer
The correct answer is: If assertion is true, but reason is false
$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is less soluble in water. $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ 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.

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