Question:
Thermal decomposition of ammonium dichromate gives
Thermal decomposition of ammonium dichromate gives
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This reaction is called the “volcano experiment” — produces green Cr$_2$O$_3$.
Updated On: May 2, 2026
- N$_2$, H$_2$O and Cr$_2$O$_3$
- N$_2$, NH$_3$ and CrO
- (NH$_4$)$_2$CrO$_4$ and H$_2$O
- N$_2$, H$_2$O and CrO$_3$
- N$_2$, H$_2$O and CrO
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The Correct Option is A
Solution and Explanation
Concept: Thermal decomposition reaction
Ammonium dichromate undergoes decomposition on heating: \[ (NH_4)_2Cr_2O_7 \xrightarrow{\Delta} N_2 + Cr_2O_3 + 4H_2O \] ---
Step 1: Identify products
• Nitrogen gas (N$_2$)
• Water vapour (H$_2$O)
• Chromium(III) oxide (Cr$_2$O$_3$) ---
Step 2: Verify oxidation changes
• Nitrogen reduced → forms N$_2$
• Chromium reduced from +6 to +3 → Cr$_2$O$_3$ ---
Step 3: Match with options
Correct combination: \[ N_2 + H_2O + Cr_2O_3 \] --- Final Answer: \[ \boxed{\text{(A)}} \]
Ammonium dichromate undergoes decomposition on heating: \[ (NH_4)_2Cr_2O_7 \xrightarrow{\Delta} N_2 + Cr_2O_3 + 4H_2O \] ---
Step 1: Identify products
• Nitrogen gas (N$_2$)
• Water vapour (H$_2$O)
• Chromium(III) oxide (Cr$_2$O$_3$) ---
Step 2: Verify oxidation changes
• Nitrogen reduced → forms N$_2$
• Chromium reduced from +6 to +3 → Cr$_2$O$_3$ ---
Step 3: Match with options
Correct combination: \[ N_2 + H_2O + Cr_2O_3 \] --- Final Answer: \[ \boxed{\text{(A)}} \]
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