Acids, Bases, and pH MCQs with Answers

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Acids, Bases, and pH Online MCQs with Answers

An acid is a substance that:
a) Accepts protons
b) Donates protons
c) Accepts electrons
d) Donates electrons

Answer
b) Donates protons

A base is a substance that:
a) Accepts protons
b) Donates protons
c) Accepts electrons
d) Donates electrons

Answer
a) Accepts protons

The pH scale is a measure of:
a) Temperature
b) Concentration of protons
c) Concentration of hydroxide ions
d) Concentration of electrons

Answer
b) Concentration of protons

The pH scale ranges from:
a) 0 to 7
b) 0 to 14
c) 7 to 14
d) -7 to 7

Answer
b) 0 to 14

A pH of 7 indicates a:
a) Neutral solution
b) Acidic solution
c) Basic solution
d) Alkaline solution

Answer
a) Neutral solution

A pH less than 7 indicates a:
a) Neutral solution
b) Acidic solution
c) Basic solution
d) Alkaline solution

Answer
b) Acidic solution

A pH greater than 7 indicates a:
a) Neutral solution
b) Acidic solution
c) Basic solution
d) Alkaline solution

Answer
c) Basic solution

A solution with a pH of 1 is:
a) Neutral
b) Slightly acidic
c) Highly acidic
d) Slightly basic

Answer
c) Highly acidic

A solution with a pH of 8 is:
a) Neutral
b) Slightly acidic
c) Highly acidic
d) Slightly basic

Answer
d) Slightly basic

The concentration of hydrogen ions (H+) in a solution with a pH of 3 is:
a) 10-3 M
b) 10-7 M
c) 10-10 M
d) 10-14 M

Answer
a) 10-3 M

The concentration of hydroxide ions (OH-) in a neutral solution is:
a) 10-3 M
b) 10-7 M
c) 10-10 M
d) 10-14 M

Answer
b) 10-7 M

A strong acid:
a) Dissociates completely in water
b) Partially dissociates in water
c) Does not dissociate in water
d) Reacts with water to form a base

Answer
a) Dissociates completely in water

A weak acid:
a) Dissociates completely in water
b) Partially dissociates in water
c) Does not dissociate in water
d) Reacts with water to form a base

Answer
b) Partially dissociates in water

Which of the following is a strong acid?
a) Acetic acid (CH3COOH)
b) Hydrochloric acid (HCl)
c) Carbonic acid (H2CO3)
d) Phosphoric acid (H3PO4)

Answer
b) Hydrochloric acid (HCl)

Which of the following is a weak acid?
a) Nitric acid (HNO3)
b) Sulfuric acid (H2SO4)
c) Acetic acid (CH3COOH)
d) Perchloric acid (HClO4)

Answer
c) Acetic acid (CH3COOH)

A strong base:
a) Accepts protons completely in water
b) Donates protons completely in water
c) Accepts electrons completely in water
d) Donates electrons completely in water

Answer
a) Accepts protons completely in water

A weak base:
a) Accepts protons partially in water
b) Donates protons partially in water
c) Accepts electrons partially in water
d) Donates electrons partially in water

Answer
a) Accepts protons partially in water

Which of the following is a strong base?
a) Ammonium hydroxide (NH4OH)
b) Sodium hydroxide (NaOH)
c) Carbon dioxide (CO2)
d) Phosphoric acid (H3PO4)

Answer
b) Sodium hydroxide (NaOH)

Which of the following is a weak base?
a) Calcium hydroxide (Ca(OH)2)
b) Potassium hydroxide (KOH)
c) Ammonium hydroxide (NH4OH)
d) Nitric acid (HNO3)

Answer
c) Ammonium hydroxide (NH4OH)

A salt is formed by the reaction between:
a) An acid and a base
b) An acid and a salt
c) A base and a salt
d) Two salts

Answer
a) An acid and a base

The conjugate acid of a base is:
a) The protonated form of the base
b) The deprotonated form of the base
c) The same as the base
d) Not related to the base

Answer
a) The protonated form of the base

The conjugate base of an acid is:
a) The protonated form of the acid
b) The deprotonated form of the acid
c) The same as the acid
d) Not related to the acid

Answer
b) The deprotonated form of the acid

A buffer solution is composed of:
a) A weak acid and its conjugate base
b) A strong acid and its conjugate base
c) A weak acid and a strong base
d) A strong acid and a weak base

Answer
a) A weak acid and its conjugate base

A buffer solution is used to:
a) Maintain a constant pH
b) Increase the pH of a solution
c) Decrease the pH of a solution
d) Neutralize an acidic solution

Answer
a) Maintain a constant pH

The pKa of an acid is a measure of its:
a) Basicity
b) Acidity
c) Ionization constant
d) Concentration

Answer
b) Acidity

Which of the following acids is the weakest?
a) Hydrochloric acid (HCl)
b) Sulfuric acid (H2SO4)
c) Nitric acid (HNO3)
d) Acetic acid (CH3COOH)

Answer
d) Acetic acid (CH3COOH)

Which of the following bases is the weakest?
a) Sodium hydroxide (NaOH)
b) Potassium hydroxide (KOH)
c) Ammonium hydroxide (NH4OH)
d) Calcium hydroxide (Ca(OH)2)

Answer
c) Ammonium hydroxide (NH4OH)

The term “amphoteric” refers to a substance that:
a) Acts as both an acid and a base
b) Is only acidic
c) Is only basic
d) Does not react with acids or bases

Answer
a) Acts as both an acid and a base

Which of the following is an example of an amphoteric substance?
a) Sodium hydroxide (NaOH)
b) Hydrochloric acid (HCl)
c) Water (H2O)
d) Calcium hydroxide (Ca(OH)2)

Answer
c) Water (H2O)

The process of adding a strong acid or a strong base to a solution to determine its concentration is called:
a) Titration
b) Neutralization
c) Hydrolysis
d) Oxidation

Answer
a) Titration

In a titration, the point at which the acid and base are present in stoichiometrically equivalent amounts is called:
a) Equivalence point
b) Endpoint
c) Neutral point
d) Transition point

Answer
a) Equivalence point

An indicator is a substance that:
a) Changes color at the equivalence point of a titration
b) Changes color at the endpoint of a titration
c) Reacts with acids and bases
d) Acts as a catalyst in a titration

Answer
b) Changes color at the endpoint of a titration

Litmus paper turns _____ in an acidic solution and _____ in a basic solution.
a) Red, blue
b) Blue, red
c) Yellow, green
d) Green, yellow

Answer
b) Blue, red

Phenolphthalein turns _____ in an acidic solution and _____ in a basic solution.
a) Red, blue
b) Blue, red
c) Yellow, green
d) Green, yellow

Answer
a) Red, blue

Methyl orange turns _____ in an acidic solution and _____ in a basic solution.
a) Red, blue
b) Blue, red
c) Yellow, green
d) Green, yellow

Answer
a) Red, blue

Bromothymol blue turns _____ in an acidic solution and _____ in a basic solution.
a) Red, blue
b) Blue, red
c) Yellow, green
d) Green, yellow

Answer
c) Yellow, green

A pH indicator is most effective when its pKa is:
a) Close to 0
b) Close to 7
c) Close to 14
d) Not related to pH

Answer
b) Close to 7

Acid rain is caused by the presence of _____ in the atmosphere.
a) Carbon dioxide
b) Nitrogen
c) Sulfur dioxide
d) Oxygen

Answer
c) Sulfur dioxide

Acid rain can have harmful effects on:
a) Plants
b) Buildings and monuments
c) Aquatic life
d) All of the above

Answer
d) All of the above

Antacids are used to:
a) Increase the acidity of the stomach
b) Decrease the acidity of the stomach
c) Neutralize acids in the stomach
d) Enhance the production of acids in the stomach

Answer
c) Neutralize acids in the stomach

The primary component of stomach acid is:
a) Hydrochloric acid (HCl)
b) Sulfuric acid (H2SO4)
c) Nitric acid (HNO3)
d) Acetic acid (CH3COOH)

Answer
a) Hydrochloric acid (HCl)

The pH of the human body is generally:
a) 1
b) 7
c) 14
d) Slightly acidic

Answer
d) Slightly acidic

Which of the following is an example of a strong acid found in nature?
a) Citric acid
b) Ascorbic acid
c) Hydrochloric acid
d) Acetic acid

Answer
c) Hydrochloric acid

Which of the following is an example of a weak acid found in nature?
a) Lactic acid
b) Sulfuric acid
c) Nitric acid
d) Perchloric acid

Answer
a) Lactic acid

Which of the following is an example of a strong base found in nature?
a) Ammonium hydroxide
b) Sodium hydroxide
c) Potassium hydroxide
d) Calcium hydroxide

Answer
b) Sodium hydroxide

Which of the following is an example of a weak base found in nature?
a) Ammonium hydroxide
b) Sodium hydroxide
c) Potassium hydroxide
d) Calcium hydroxide

Answer
a) Ammonium hydroxide

The process of neutralization involves the reaction between:
a) An acid and a base
b) An acid and a salt
c) A base and a salt
d) Two salts

Answer
a) An acid and a base

The neutralization of an acid and a base results in the formation of:
a) Water and a salt
b) Water and an acid
c) Water and a base
d) Water and an oxide

Answer
a) Water and a salt

Which of the following substances is amphoteric?
a) Sodium hydroxide (NaOH)
b) Hydrochloric acid (HCl)
c) Water (H2O)
d) Calcium hydroxide (Ca(OH)2)

Answer
c) Water (H2O)

Which of the following is used to measure the pH of a solution?
a) pH meter
b) Litmus paper
c) pH indicator
d) All of the above

Answer
d) All of the above

A solution with a pH of 3 is _____ times more acidic than a solution with a pH of 6.
a) 3
b) 10
c) 100
d) 1000

Answer
c) 100

A solution with a pH of 10 is _____ times more basic than a solution with a pH of 7.
a) 3
b) 10
c) 100
d) 1000

Answer
c) 100

The term “pOH” is used to represent the:
a) Concentration of protons in a solution
b) Concentration of hydroxide ions in a solution
c) pH of a solution
d) pKa of an acid

Answer
b) Concentration of hydroxide ions in a solution

The relationship between pH and pOH is:
a) pH + pOH = 7
b) pH + pOH = 14
c) pH = 7 – pOH
d) pH = 14 – pOH

Answer
b) pH + pOH = 14

The dissociation of an acid in water is described by the:
a) Ionization constant (Ka)
b) Dissociation constant (Kd)
c) Equilibrium constant (K)
d) None of the above

Answer
a) Ionization constant (Ka)

The dissociation of a base in water is described by the:
a) Ionization constant (Kb)
b) Dissociation constant (Kd)
c) Equilibrium constant (K)
d) None of the above

Answer
a) Ionization constant (Kb)

The concentration of hydroxide ions (OH-) in a solution with a pOH of 5 is:
a) 10-5 M
b) 10-7 M
c) 10-9 M
d) 10-14 M

Answer
a) 10-5 M

The concentration of hydrogen ions (H+) in a solution with a pOH of 9 is:
a) 10-5 M
b) 10-7 M
c) 10-9 M
d) 10-14 M

Answer
a) 10-5 M

The concentration of hydroxide ions (OH-) in a solution with a pH of 2 is:
a) 10-2 M
b) 10-7 M
c) 10-12 M
d) 10-14 M

Answer
c) 10-12 M

The concentration of hydrogen ions (H+) in a solution with a pH of 12 is:
a) 10-2 M
b) 10-7 M
c) 10-12 M
d) 10-14 M

Answer
c) 10-12 M

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