1 pts Which of the following reactions is a combustion reaction?
1. SO2 + O2 —— SO3
II. H202—— H2O + O2
III. C3H7OH + O2—— CO2 + H2O
A. III only
B. I and II only
C. I and III only
D. II and III only

A. III only

Explanation:

Combustion reaction:

Combustion reaction is the one in which substance are burn in the presence of oxygen and yield carbon dioxide and water.

2C₃H₇OH + 9O₂—— 6CO₂ + 8H₂O

The given reaction is the combustion reaction.

Other options are incorrect because,

Reaction 1 is synthesis reaction.

2SO₂ + O₂   →    2SO₃

Synthesis reaction:

It is the reaction in which two or more simple substance react to give one or more complex product.

A + B     →   AB

Reaction 2 is decomposition reaction.

H₂O₂    →  H₂O + O₂

Decomposition reaction:

It is the reaction in which one reactant is break down into two or more product.

AB → A + B

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answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.