Acid formulas can be distinguished from base formulas because acid formulas usually and base formulas .
a.
begin with hydrogen; pair a metal with a hydroxide ion
b.
begin with a nonmetal; pair a nonmetal with a hydoxide ion
c.
pair a metal with a hydrogen ion; begin with a nonmetal
d.
pair a metal with a hydroxide ion; begin with hydrogen

A.  begin with hydrogen; pair a metal with a hydroxide ion

Explanation:

Acid can be distinguished from base on the basis of formulas in such a way that acid formula start with hydrogen.

For example:

Hydrochloric acid is strong acid. Its formula is HCl.

It start with hydrogen

Sulfuric acid is acid. Its formula is H₂SO₄

it is also start with hydrogen.

Base:

Base is distinguish from acid in such a way that in base formula metal is pair with hydroxide ion.

For example:

Sodium hydroxide is base. Its formula is NaOH.

sodium is metal while OH is hydroxide ion.

Potassium hydroxide is base. its formula is KOH.

potassium is metal and OH is hydroxide ion.

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explanation:

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a electronegativity decreases beacuse the size of nucleus is bigger.