An acid is a compound that produces the ion in solution, which is also written as the hydronium ion . A base is a compound that produces an ion with the formula and the name ion.

An acid is substance that produces H⁺  ions in solution, which is also written as the hydronium ion H₃O⁺. A base is a substance that produces an ion with the formula OH⁻ and the name hydroxyl ion.

Explanation:

An acid is substance that produces H⁺  ions in solution, which is also written as the hydronium ion H₃O⁺. A base is a substance that produces an ion with the formula OH⁻ and the name hydroxyl ion.

Acid:

An acid is the substance that sour in taste and turns the color of litmus paper from blue to red.

pH of acid is less than seven.

Base:

An acid is the substance that bitter in taste and turns the color of litmus paper from red to blue.

The pH of base is 7-14.

Arrhenius gives the simplest definition of acid and base.

Arrhenius acid:

A substance that increase the concentration of hydronium ion in solution is called acid.

HNO₃       →       H⁺ + NO₃⁻

            (H₂O)

Arrhenius base:

A substance that increase the concentration of  OH⁻ ion in solution is called base.

KOH   →  K⁺ + OH⁻

11 players on a field that has a maximum of 11 players

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be