What is a substance? a. a uniform mixture that can’t be separated b. a mixture that can be separated c. a single component that can’t be separated d. a single component that can be separated

Answer : The correct option is, (C) a single component that can’t be separated.

Explanation :

Substance : It is the pure form of matter or we can say that it is a matter that contains only one type of molecule of atom. It can not be separated by physical process.

For example : Water is a substance.

Mixture : It is a combination of different type of atoms or molecules and it is an impure form.

For example : Sodium chloride with water is a mixture.

Hence, the correct option is, (C) a single component that can’t be separated.

a electronegativity decreases beacuse the size of nucleus is bigger.