Answer: B) combustion reaction.
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: [tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
B) combustion reaction: When a hydrocarbon reacts with oxygen to produce carbon dioxide and water, this type of reaction is combustion reaction.
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
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.
[tex]Na_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+NaCl(aq)[/tex]
D) gas evolution reaction: a reaction in which one of the product is formed as a gas.
[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]
