Question:
Which of the following is used to convert sodium chromate to sodium dichromate in the preparation of potassium dichromate?
Which of the following is used to convert sodium chromate to sodium dichromate in the preparation of potassium dichromate?
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Sodium chromate is converted to sodium dichromate by heating with concentrated sulfuric acid, a common step in the preparation of potassium dichromate.
Updated On: Apr 18, 2026
- \( \text{Na}_2\text{CO}_3 \)
- \( \text{NaOH} \)
- \( \text{KClO}_3 \)
- \( \text{H}_2\text{SO}_4 \)
- \( \text{H}_2\text{O}_2 \)
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The Correct Option is D
Solution and Explanation
Sodium chromate (\( \text{Na}_2\text{CrO}_4 \)) is converted to sodium dichromate (\( \text{Na}_2\text{Cr}_2\text{O}_7 \)) in the presence of concentrated sulfuric acid (\( \text{H}_2\text{SO}_4 \)).
The chemical reaction is:
\[
\text{Na}_2\text{CrO}_4 + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{Cr}_2\text{O}_7 + \text{H}_2\text{O}
\]
Step 1: Conversion of sodium chromate to sodium dichromate.
The sulfuric acid acts as a dehydrating agent, converting sodium chromate to sodium dichromate. This reaction is essential in the preparation of potassium dichromate.
Step 2: Conclusion.
Therefore, the correct answer is (D) \( \text{H}_2\text{SO}_4 \), as sulfuric acid is used to convert sodium chromate to sodium dichromate.
Final Answer:} (D) \( \text{H}_2\text{SO}_4 \)
The sulfuric acid acts as a dehydrating agent, converting sodium chromate to sodium dichromate. This reaction is essential in the preparation of potassium dichromate.
Step 2: Conclusion.
Therefore, the correct answer is (D) \( \text{H}_2\text{SO}_4 \), as sulfuric acid is used to convert sodium chromate to sodium dichromate.
Final Answer:} (D) \( \text{H}_2\text{SO}_4 \)
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