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Heating of ammonium dichromate produces: a.) NH3, Cr2O3 and H2O b.) N2, Cr2O3 and H2O c.) NO, CrO3 and H2O d.) N2O, CrO3 and H2O

Heating of ammonium dichromate produces:
a.) NH3, Cr2O3 and H2O
b.) N2, Cr2O3 and H2O
c.) NO, CrO3 and H2O
d.) N2O, CrO3 and H2O

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60782 Points
one year ago
When heated, Ammonium dichromate decomposes and produces orange sparks and an effect that looks like a miniature volcanic eruption. The process of heating and decomposition of Ammonium dichromate is also known as the volcano effect. Complete step-by-step answer: When ammonium dichromate is heated, its decomposition gives off orange sparks. It also throws green coloured chromium (III) oxide crystals into the air which looks like a miniature volcanic eruption. The chromium (III) oxide crystals produced by the so-called volcanic eruption when ammonium dichromate is heated, is ‘fluffier’ than the ammonium dichromate crystals itself. A lot of the mass of the ammonium dichromate is released as water vapour into the air and the product grows in volume. A large amount of Nitrogen gas is also formed during the reaction. The reaction of Ammonium dichromate when heated is a redox reaction in which chromium is reduced from its + 6 oxidation state in dichromate to + 3 Oxidation state in chromium trioxide. With the formula given below, we can see that on heating ammonium dichromate, it decomposes into chromium (III) oxide crystals, nitrogen gas and water vapour. (NH4)2Cr2O7(s) → Cr2O3(s) + N2(g) + 4H2O(g) Hence, heating of ammonium dichromate produces N2, Cr2O3 and H2O. Therefore, Option B is the correct option. Note: Reducing agent loses electrons and is oxidized while an oxidizing agent gains electrons and is reduced. This is the basis of a Redox reaction. In a Redox reaction, both oxidation and reduction occurs in the same chemical reaction. The heating of ammonium dichromate is a prime example of one such redox reaction.

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