The earliest and simplest definition of acids and bases was suggested by . He/They defined an acid as a substance with in its formula that dissociates in water to yield and a base as a substance with in its formula that dissociates in water to yield .

Arrhenius

H, H₃O⁺

OH, OH⁻

Explanation:

The earliest and simplest definition of acids and bases was suggested by Arrhenius. He/They defined an acid as a substance with hydrogen in its formula that dissociates in water to yield H₃O⁺ and a base as a substance with OH in its formula that dissociates in water to yield OH⁻.

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⁻

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

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