Question:
The nature of chromium oxide formed by the thermal decomposition of ammonium dichromate is
The nature of chromium oxide formed by the thermal decomposition of ammonium dichromate is
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Many transition metal oxides in intermediate oxidation states show amphoteric behavior.
Updated On: Jun 8, 2026
- acidic
- basic
- neutral
- amphoteric
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The Correct Option is D
Solution and Explanation
Concept:
On heating ammonium dichromate, chromium(III) oxide is formed.
Step 1: Write the decomposition reaction.
\[ (NH_4)_2Cr_2O_7 \rightarrow Cr_2O_3 + N_2 + 4H_2O \] The oxide formed is: \[ Cr_2O_3 \]
Step 2: Determine the nature of \(Cr_2O_3\).
Chromium(III) oxide reacts with both acids and bases: \[ Cr_2O_3 + 6HCl \rightarrow 2CrCl_3 + 3H_2O \] \[ Cr_2O_3 + 2NaOH \rightarrow 2NaCrO_2 + H_2O \] Therefore, \(Cr_2O_3\) is amphoteric. Hence: \[ \boxed{\text{amphoteric}} \]
Step 1: Write the decomposition reaction.
\[ (NH_4)_2Cr_2O_7 \rightarrow Cr_2O_3 + N_2 + 4H_2O \] The oxide formed is: \[ Cr_2O_3 \]
Step 2: Determine the nature of \(Cr_2O_3\).
Chromium(III) oxide reacts with both acids and bases: \[ Cr_2O_3 + 6HCl \rightarrow 2CrCl_3 + 3H_2O \] \[ Cr_2O_3 + 2NaOH \rightarrow 2NaCrO_2 + H_2O \] Therefore, \(Cr_2O_3\) is amphoteric. Hence: \[ \boxed{\text{amphoteric}} \]
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