Chemical volcano is an example of:

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Combination reaction

Decomposition reaction

Displacement reaction

None of the above

answer is B.

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Detailed Solution

Concept- Chemical volcano experiment is a miniature form of volcano expansion. Ammonium dichromate is the reagent used for the reaction.
In a chemical volcano, when ammonium dichromate crystals are heated it gives off orange sparks and green crystals of chromium oxide by a mini-explosion. The reaction can be written as;

Now, a decomposition type of reaction is the one in which one reactant is decomposed (broken down) into two or more than two products.
Thus Chemical volcano is a perfect example for decomposition reaction.
Hence, the correct option is (2).

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