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What is formed when ammonium dichromate is heated?
Nitrogen, oxygen and chromium oxide
Chromium oxide and water
Chromium and oxygen
Chromium oxide and nitrogen
Nitrogen, oxygen and chromium oxide
When ammonium dichromate ((NH4)2Cr2O7) is heated, it undergoes a dramatic thermal decomposition reaction to produce nitrogen gas (N2), water vapor (H2O), and chromium(III) oxide (Cr2O3). This reaction is often demonstrated as a 'volcano' experiment due to the rapid evolution of gases causing the solid to expand and scatter green ash resembling volcanic lava.
When ammonium dichromate ((NH4)2Cr2O7) is heated, it undergoes a dramatic thermal decomposition reaction to produce nitrogen gas (N2), water vapor (H2O), and chromium(III) oxide (Cr2O3). This reaction is often demonstrated as a 'volcano' experiment due to the rapid evolution of gases causing the solid to expand and scatter green ash resembling volcanic lava.
Ammonium dichromate thermal decomposition is a classic example of an intramolecular redox reaction, where the ammonium ion acts as the reducing agent and the dichromate ion acts as the oxidizing agent.
Chemical formula of ammonium dichromate is (NH4)2Cr2O7.
The reaction is exothermic and self-sustaining once initiated by heat.
Chromium(III) oxide (Cr2O3) is a green-colored powder left behind as residue.
Option A is correct because heating ammonium dichromate yields nitrogen gas, water vapor, and chromium(III) oxide.
Option B is incomplete as it misses nitrogen gas.
Option C is incorrect because free chromium metal is not produced in this thermal decomposition.
Option D misses water vapor which is also a primary product of the reaction.
A is correct тАФ Heating ammonium dichromate produces nitrogen, water vapor, and chromium oxide.
Thermal decomposition reactions of ammonium salts are frequently tested in competitive chemistry exams to check understanding of gas evolution and oxidation states.
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