Chemistry

Acids and Bases

579 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

The characteristic odour of garlic is due to

  1. a chloro compound

  2. a sulpher compound

  3. a fluorine compound

  4. acetic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The characteristic pungent odour of garlic is primarily due to organosulphur compounds, such as allicin, which are released when garlic is crushed.

Multiple choice

Antacids are called

  1. milk of mango

  2. milk of magnesia

  3. milk of pineapple

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Milk of magnesia is a suspension of magnesium hydroxide, which is a common antacid used to treat heartburn and indigestion.

Multiple choice

The strength of an acid or base is measured on a

  1. vernier scale

  2. musical scale

  3. pH scale

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pH scale is a logarithmic scale used to specify the acidity or basicity of an aqueous solution. It is the standard tool for measuring the strength of acids and bases.

Multiple choice

Which one of the following acts as a strong acid?

  1. Para-nitrophenol

  2. Phenol

  3. Ortho-cresol

  4. Meta-cresol

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

This option is correct because the para-nitrophenol contains the electron withdrawing group at para position of the phenolic compound. Therefore, it incereases the acidity of the compound of phenol.

Multiple choice

Which of the following is an acidic salt?

  1. ZnSO4

  2. Pb(OH)Cl

  3. NaCl

  4. NaHSO4

  5. CuSO4.5H2O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Acidic salts are those, which contain hydrogen ion. NaHSO4 contains hydrogen ion. Hence, it is an acidic salt.

Multiple choice

Which one of the following substances is different from others on the basis of acidity?

  1. Barium hydroxide

  2. Calcium hydroxide

  3. Magnesium hydroxide

  4. Sodium hydroxide

  5. Zinc hydroxide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The number of hydroxyl ions present in one molecule of base is called its acidity. In sodium hydroxide, only one hydroxyl ion is present, so its acidity is 1 while others have 2 hydroxyl ions, so the acidity is 2. The number of hydroxyl ions present in one molecule of base is called its acidity. In sodium hydroxide, only one hydroxyl ion is present, so its acidity is 1 while others have 2 hydroxyl ions, so the acidity is 2.Zinc hydroxide contain 2 hydroxyl ions, so its acidity is also 2.

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.