Question:
If CO\(_2\)(g) under pressure is passed into Na\(_2\)CrO\(_4\) (aq), yellow colour solution changes to
If CO\(_2\)(g) under pressure is passed into Na\(_2\)CrO\(_4\) (aq), yellow colour solution changes to
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CrO\(_4^{2-}\) (yellow) in basic/neutral; Cr\(_2\)O\(_7^{2-}\) (orange-red) in acidic.
Updated On: Apr 23, 2026
- blue
- green
- red
- orange-red
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
CO\(_2\) dissolves in water to form carbonic acid (H\(_2\)CO\(_3\)), which is acidic. Chromate (yellow) converts to dichromate (orange-red) in acidic medium.
Step 2: Detailed Explanation:
2CrO\(_4^{2-}\) (yellow) + 2H\(^+\) \(\rightarrow\) Cr\(_2\)O\(_7^{2-}\) (orange-red) + H\(_2\)O.
CO\(_2\) + H\(_2\)O \(\rightarrow\) H\(_2\)CO\(_3\) \(\rightarrow\) 2H\(^+\) + CO\(_3^{2-}\).
Step 3: Final Answer:
Thus, colour changes from yellow to orange-red.
CO\(_2\) dissolves in water to form carbonic acid (H\(_2\)CO\(_3\)), which is acidic. Chromate (yellow) converts to dichromate (orange-red) in acidic medium.
Step 2: Detailed Explanation:
2CrO\(_4^{2-}\) (yellow) + 2H\(^+\) \(\rightarrow\) Cr\(_2\)O\(_7^{2-}\) (orange-red) + H\(_2\)O.
CO\(_2\) + H\(_2\)O \(\rightarrow\) H\(_2\)CO\(_3\) \(\rightarrow\) 2H\(^+\) + CO\(_3^{2-}\).
Step 3: Final Answer:
Thus, colour changes from yellow to orange-red.
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