Acid Base Theory | MCQs

Explanation

Indicators are colored organic compounds that change color depending on the pH of the solution.

Common examples include litmus, phenolphthalein, and methyl orange.

Explanation

A polyprotic acid is an acid that can donate more than one proton (H⁺) per molecule.

1. H₃PO₄ (Phosphoric acid) → Triprotic acid (can donate 3 H⁺ ions)
2. HCN (Hydrocyanic acid) → Monoprotic (donates only 1 H⁺)
3. HCl (Hydrochloric acid) → Monoprotic

Explanation

Explanation

pH = –log [H⁺]

It measures the acidity or alkalinity of a solution based on the hydrogen ion concentration.

The pH scale ranges from 1 to 14, with:

• 1-6 being acidic
• 7 being neutral (neither acidic nor basic)
• 8-14 being basic (alkaline)

Explanation

A conjugate acid, within the Brønsted–Lowry acid-base theory,

is a chemical compound formed when an acid donates a proton (H+) to a base

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ND17-1-2023