Question

Quəstíøn:—
What is alkaline???​

Answer 1

Simple def.

Having the properties of an alkali, or containing alkali; having a pH greater than 7.

OR

Chemical def.

An adjective that describes a chemical that produces hydroxide ions (OH-) in a solution. These solutions are also referred to as basic — as in the opposite of acidic — and have a pH above 7.

Answer 2

Answer:

Alkaline means basic

"Which on reaction with water give basic solution"

That is why elements of group 2nd called alkaline earth metals.