Chemistry

Acids and Bases

594 Questions

Acids and bases questions cover the chemical properties, common examples, and theoretical concepts of acidic and basic substances. Topics include identifying proton acceptors, recognizing amphoteric substances, and knowing the sources of everyday organic acids. These foundational chemistry questions are common across SSC, banking, and railways examinations.

Acid and base propertiesOrganic acidsAmphoteric substancesProton donors and acceptorsChemical formulas

Acids and Bases Questions

Multiple choice

Which statement about acids or alkalis is true?

  1. Acids are not safe enough to be used in food preparations because they are too sour in taste.

  2. Antacids in indigestion mixtures are weak acids.

  3. Acids and alkalis are not made safer by diluting with water.

  4. Oven spray cleaners can be moderately alkaline.

  5. Orange juice is a strongly acid solution.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, most of oven sprays contain ammonia solution, which are completely alkaline.

Multiple choice

Which substance can be classified as an Arrhenius acid?

  1. NaCl

  2. KOH

  3. LiOH

  4. HCl

  5. ZnSO4.7H2O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the definition, an Arrhenius acid yields hydrogen ions as the only positive ions in the aqueous solution. Here, HCl forms H+ ions. Therefore, it is an Arrhenius acid.

Multiple choice

Drinking soda is

  1. neutral

  2. an oxidising agent

  3. acidic in nature

  4. basic in nature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Drinking soda contains dissolved carbon dioxide, which forms carbonic acid in water. This gives soda an acidic pH, typically ranging between 2.5 and 4.0.

Multiple choice

All acids essentially contain the element

  1. oxygen

  2. chlorine

  3. sulphur

  4. hydrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the Arrhenius definition, an acid is a substance that dissociates in water to produce hydrogen ions (H+). Therefore, hydrogen is the essential element in all acids.

Multiple choice

Which sign is used between reactant and product to show that an acid is completely ionized to form ions in a chemical equation?

  1. Single arrow pointing towards right

  2. Double arrows pointing towards right

  3. Double arrows pointing towards right as well as left

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Single arrow pointing towards right is used between reactant and product to show that an acid is completely ionized to form ions in a chemical equation.

Multiple choice

Which of the following substances do not show acidic behaviour?

  1. HCl gas

  2. Diluted hydrochloric acid

  3. Diluted sulphuric acid

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The compound hydrogen chloride has the formula HCl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrogen chloride gas and hydrochloric acid are important in technology and industry. The formula HCl is often used to refer, somewhat misleadingly, to hydrochloric acid, an aqueous solution that can be derived from hydrogen chloride.