Areaction occurs when an acid and base combine.
a. salt-water
c. neutralization
b. combustion
d. hydrolysis

The correct answer is C. Neutralization

Explanation:

In chemistry, a neutralization reaction occurs as a substance with a low pH or one that can donate hydrogen ions (also known as acid) reacts with a substance with a high pH or one that releases hydroxide (also known as base). This leads to the pH being neutralized which means the substance that is produced after the reaction is ideally neutral and therefore does not contain an excess of hydroxide or hydrogen ions that are present in acids or bases. According to this, the reaction that occurs when an acid and a base combine is Neutralization.

pure substance: iron,copper

impure substance: water,charcoal

m=9

step-by-step explanation: