Question

A reaction in which a substance reacts with oxygen, emitting heat and forming oxygen-containing compounds is an example of a(n):

A) acid-base reaction.
B) combustion reaction.
C) precipitation reaction.
D) gas evolution reaction.

Answer 1

Answer: B) combustion reaction.

Step-by-step explanation:

A) acid-base reaction: When an acid reacts with a base, to form metal salt and water, this type of reaction is Acid Base reaction.

Example:
`HCl+NaOH\rightarrow NaCl+H_2O`

B) combustion reaction: When a hydrocarbon reacts with oxygen to produce carbon dioxide and water, this type of reaction is combustion reaction.

`CH_4+2O_2\rightarrow CO_2+2H_2O`

C) precipitation reaction: a reaction in which aqueous solution of two compounds on mixing react to form an insoluble compound which separate out as a solid are called precipitation reactions.

`Na_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+NaCl(aq)`

D) gas evolution reaction: a reaction in which one of the product is formed as a gas.

`CaCO_3(s)\rightarrow CaO(s)+CO_2(g)`