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 of the following is an example of a Lewis acid?

  1. Hydroxide ion

  2. Hydrogen ion

  3. Boron trifluoride

  4. Ammonia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Boron trifluoride is a Lewis acid because it can accept a pair of electrons to form a coordinate bond.

Multiple choice

What is the name of the compound with the formula $H_2SO_4$?

  1. Sulfuric acid

  2. Hydrochloric acid

  3. Nitric acid

  4. Acetic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The compound with the formula $H_2SO_4$ is called sulfuric acid, a strong mineral acid.

Multiple choice

What is the chemical formula for sulfuric acid?

  1. H2SO3

  2. H2SO4

  3. H3SO3

  4. H3SO4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sulfuric acid is a compound composed of hydrogen, sulfur, and oxygen atoms. The chemical formula for sulfuric acid is H2SO4, which indicates that there are two hydrogen atoms, one sulfur atom, and four oxygen atoms in each molecule.

Multiple choice

What is the chemical formula for hydrochloric acid?

  1. HCl

  2. H2Cl

  3. HCl2

  4. H2Cl2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydrochloric acid is a compound composed of hydrogen and chlorine atoms. The chemical formula for hydrochloric acid is HCl, which indicates that there is one hydrogen atom and one chlorine atom in each molecule.

Multiple choice

What is the chemical formula for nitric acid?

  1. HNO3

  2. HNO2

  3. H2NO3

  4. H2NO2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitric acid is a compound composed of hydrogen, nitrogen, and oxygen atoms. The chemical formula for nitric acid is HNO3, which indicates that there is one hydrogen atom, one nitrogen atom, and three oxygen atoms in each molecule.

Multiple choice

What is the chemical formula for sulfuric acid?

  1. H2SO4

  2. HNO3

  3. HCl

  4. NaOH
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The chemical formula for sulfuric acid is H2SO4.

Multiple choice

What is the most common cause of chemical burns?

  1. Acids

  2. Bases

  3. Solvents

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Chemical burns can be caused by acids, bases, solvents, or any other corrosive substance.

Multiple choice

Which of the following is a buffer solution?

  1. A solution that contains a weak acid and its conjugate base.

  2. A solution that contains a weak base and its conjugate acid.

  3. A solution that contains both a weak acid and a weak base.

  4. A solution that contains a salt of a weak acid and a strong base.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added to it. Buffer solutions typically contain a weak acid and its conjugate base or a weak base and its conjugate acid.

Multiple choice

What is the name of the chemical compound that is commonly known as vinegar?

  1. Acetic acid

  2. Citric acid

  3. Lactic acid

  4. Tartaric acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acetic acid is the chemical compound that is commonly known as vinegar. It is a colorless, pungent liquid that is used as a condiment and as a preservative.

Multiple choice

Which of the following is an acid?

  1. Sodium hydroxide (NaOH)

  2. Hydrochloric acid (HCl)

  3. Sodium bicarbonate (NaHCO3)

  4. Potassium chloride (KCl)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An acid is a substance that donates a proton (H+ ion) when dissolved in water. Hydrochloric acid (HCl) is a strong acid that donates a proton to form hydrogen ions (H+).

Multiple choice

Which of the following is a base?

  1. Sulfuric acid (H2SO4)

  2. Ammonia (NH3)

  3. Carbon dioxide (CO2)

  4. Nitric acid (HNO3)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A base is a substance that accepts a proton (H+ ion) when dissolved in water. Ammonia (NH3) is a weak base that accepts a proton to form ammonium ions (NH4+).

Multiple choice

What is the conjugate acid of ammonia (NH3)?

  1. Ammonium ion (NH4+)

  2. Hydroxide ion (OH-)

  3. Hydronium ion (H3O+)

  4. Hydrogen ion (H+)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The conjugate acid of a base is the species that is formed when the base accepts a proton. When ammonia (NH3) accepts a proton, it forms ammonium ion (NH4+).

Multiple choice

What is the conjugate base of hydrochloric acid (HCl)?

  1. Chloride ion (Cl-)

  2. Hydroxide ion (OH-)

  3. Hydronium ion (H3O+)

  4. Hydrogen ion (H+)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The conjugate base of an acid is the species that is formed when the acid donates a proton. When hydrochloric acid (HCl) donates a proton, it forms chloride ion (Cl-).

Multiple choice

Which of the following is a strong acid?

  1. Hydrochloric acid (HCl)

  2. Acetic acid (CH3COOH)

  3. Carbonic acid (H2CO3)

  4. Phosphoric acid (H3PO4)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A strong acid is an acid that completely dissociates in water to form hydrogen ions (H+) and its conjugate base. Hydrochloric acid (HCl) is a strong acid that completely dissociates in water to form hydrogen ions and chloride ions.

Multiple choice

Which of the following is a weak acid?

  1. Hydrochloric acid (HCl)

  2. Acetic acid (CH3COOH)

  3. Carbonic acid (H2CO3)

  4. Phosphoric acid (H3PO4)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A weak acid is an acid that partially dissociates in water to form hydrogen ions (H+) and its conjugate base. Acetic acid (CH3COOH) is a weak acid that partially dissociates in water to form hydrogen ions and acetate ions.