Acids and Bases: Interactive Learning Quizzes for Chemistry BSc

Question 1

Which of the following is a weak base?

Accepted Answer

Ammonia (NH3)

Answer

Sodium hydroxide (NaOH)

Answer

Potassium hydroxide (KOH)

Answer

Hydrochloric acid (HCl)

Question 2

What is the conjugate acid of the base NH3?

Accepted Answer

NH4+

Answer

NH2-

Answer

H2O

Answer

OH-

Question 3

What is the role of an indicator in acid-base titrations?

Accepted Answer

To provide a visual indication of the endpoint of the titration

Answer

To neutralize the acid or base being titrated

Answer

To catalyze the reaction between the acid and base

Answer

To absorb excess acid or base

Question 4

Which characteristic is a property of acids?

Accepted Answer

Sour taste

Answer

Basic pH

Answer

Metallic hydrogen production

Answer

Blue litmus paper transformation

Question 5

Which acid is considered strong?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Ammonium hydroxide

Question 6

In a neutral solution, what is the pH value?

Accepted Answer

7

Answer

0

Answer

14

Answer

10

Question 7

What is the conjugate base of HCl?

Accepted Answer

Cl-

Answer

H2O

Answer

H+

Answer

OH-

Question 8

Which substance can reduce a solution's pH?

Accepted Answer

Hydrochloric acid

Answer

Sodium hydroxide

Answer

Potassium chloride

Answer

Ammonium chloride

Question 9

What is the function of a buffer solution?

Accepted Answer

Maintaining stable pH levels

Answer

Enhancing acid strength

Answer

Neutralizing strong bases

Answer

Indicating pH

Question 10

Explain the distinction between a monoprotic acid and a polyprotic acid.

Accepted Answer

Monoprotic acids release one H+ ion, while polyprotic acids release multiple H+ ions

Answer

Monoprotic acids are stronger than polyprotic acids

Answer

Monoprotic acids are weaker than polyprotic acids

Answer

There is no distinction between monoprotic and polyprotic acids

Question 11

The pH of a solution is primarily determined by the concentration of:

Accepted Answer

Hydrogen ions (H+)

Answer

Hydroxide ions (OH-)

Answer

Total ions in solution

Answer

Ratio of acid to base concentration

Question 12

Which of the given substances is classified as a strong acid?

Accepted Answer

Hydrochloric acid (HCl)

Answer

Acetic acid (CH3COOH)

Answer

Carbonic acid (H2CO3)

Answer

Ammonia (NH3)

Question 13

The conjugate base of the acid H2SO4 is:

Accepted Answer

SO42-

Answer

HSO4-

Answer

OH-

Answer

H2O

Question 14

The indicator phenolphthalein undergoes a color change from:

Accepted Answer

Colourless to pink

Answer

Pink to colourless

Answer

Red to blue

Answer

Blue to red

Question 15

A buffer solution is composed of:

Accepted Answer

A weak acid and its conjugate base

Answer

A strong acid and its conjugate base

Answer

A weak base and its conjugate acid

Answer

A strong base and its conjugate acid

Question 16

Identify the Arrhenius acid among the following options:

Accepted Answer

Hydrochloric acid (HCl)

Answer

Sodium hydroxide (NaOH)

Answer

Ammonia (NH3)

Answer

Water (H2O)

Question 17

Determine the conjugate base of sulfuric acid (H2SO4):

Accepted Answer

Sulfate ion (SO42-)

Answer

Hydrogen sulfate ion (HSO4-)

Answer

Hydrogen sulfite ion (HSO3-)

Answer

Hydroxide ion (OH-)

Question 18

Which of the following indicators changes color to red in an acidic solution?

Accepted Answer

Methyl orange

Answer

Phenolphthalein

Answer

Litmus

Answer

Thymol blue

Question 19

Calculate the pKa of a weak acid with a Ka value of 10^-5:

Accepted Answer

5

Answer

2

Answer

7

Answer

9

Question 20

Predict which of the following salts will produce an acidic solution upon dissolving in water:

Accepted Answer

Ammonium chloride (NH4Cl)

Answer

Sodium chloride (NaCl)

Answer

Sodium carbonate (Na2CO3)

Answer

Potassium nitrate (KNO3)

Question 21

Determine the pH of a buffer solution created by mixing equal volumes of 0.1 M Acetic acid (CH3COOH) and 0.1 M Sodium acetate (CH3COONa):

Accepted Answer

4.7

Answer

2.0

Answer

7.0

Answer

9.2

Question 22

What does a Bronsted-Lowry base do with protons (H+ ions)?

Accepted Answer

Accepts them

Answer

Donates them

Answer

Increases their pH

Answer

Decreases their pH

Question 23

According to the Arrhenius theory, an acid is a substance that:

Accepted Answer

Produces hydrogen ions (H+) in water.

Answer

Produces hydroxide ions (OH-) in water.

Answer

Neutralizes bases.

Answer

Turns litmus paper blue.

Question 24

Which of the following is a weak acid?

Accepted Answer

Acetic acid

Answer

Hydrochloric acid

Answer

Sulfuric acid

Answer

Nitric acid

Question 25

What is the conjugate acid of NH3?

Accepted Answer

NH4+

Answer

H2O

Answer

OH-

Answer

H3O+

Question 26

Which of the following reactions is an acid-base neutralization reaction?

Accepted Answer

HCl + NaOH → NaCl + H2O

Answer

NaOH + CuSO4 → Na2SO4 + Cu(OH)2

Answer

NH3 + H2SO4 → NH4+ + HSO4-

Answer

BaCl2 + H2SO4 → BaSO4 + 2HCl

Question 27

What is the molarity of a solution made by adding 25.0 mL of 0.100 M NaOH to 50.0 mL of pure water?

Accepted Answer

0.050 M

Answer

0.100 M

Answer

0.125 M

Answer

0.200 M

Question 28

Which of the following is the strongest acid?

Accepted Answer

H2SO4

Answer

HNO3

Answer

HCl

Answer

CH3COOH

Question 29

What is the purpose of using a pH indicator in an acid-base titration?

Accepted Answer

To determine the equivalence point of the reaction.

Answer

To neutralize the solution.

Answer

To measure the volume of acid used.

Answer

To change the colour of the solution.

Question 30

Which of the following is a buffer solution?

Accepted Answer

A solution containing a weak acid and its conjugate base.

Answer

A solution containing a strong acid and a weak base.

Answer

A solution containing only a weak acid.

Answer

A solution containing only a strong base.

Question 31

According to the Bronsted-Lowry theory, which of the following is the definition of a base?

Accepted Answer

A substance that accepts a proton

Answer

A substance that decreases the concentration of hydrogen ions in a solution

Answer

A substance that releases hydrogen ions into a solution

Answer

A substance that has a pH greater than 7

Question 32

Which of the following reactions between an acid and a base results in an acidic salt?

Accepted Answer

Strong acid + Weak base

Answer

Strong acid + Strong base

Answer

Weak acid + Weak base

Answer

Weak acid + Strong base

Question 33

What is the conjugate acid of NH3?

Accepted Answer

NH4+

Answer

H2O

Answer

N2H4

Question 34

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

0.1 M HCl

Answer

0.1 M NH3

Answer

0.1 M NaCl

Answer

0.1 M CH3COOH

Question 35

What type of reaction occurs when an acid reacts with a base?

Accepted Answer

Neutralization

Answer

Precipitation

Answer

Polymerization

Answer

Redox

Question 36

What is the ionic product of water, abbreviated as Kw?

Accepted Answer

1.0 x 10^-14 at 25 °C

Answer

1.0 x 10^-2 at 25 °C

Answer

1.0 x 10^-7 at 25 °C

Answer

1.0 x 10^-11 at 25 °C

Question 37

Which of the following is a strong base?

Accepted Answer

NaOH (sodium hydroxide)

Answer

H2SO3 (sulfurous acid)

Answer

HCl (hydrochloric acid)

Answer

CH3COOH (acetic acid)

Question 38

A solution with a pH of 2 is considered:

Accepted Answer

Strongly acidic

Answer

Slightly acidic

Answer

Neutral

Answer

Slightly basic

Question 39

Which of the following is a conjugate acid-base pair?

Accepted Answer

H2O and OH-

Answer

CH3COOH and CH3COO-

Answer

HNO3 and H2SO4

Answer

HCl and NaOH

Question 40

What is the pH of a 0.1 M solution of HCl?

Accepted Answer

1

Answer

2

Answer

7

Answer

14

Question 41

What is a common application of a buffer in a biological system?

Accepted Answer

To maintain a stable pH in an organism

Answer

To increase the acidity of a solution

Answer

To neutralize acids in the stomach

Answer

To enhance the effectiveness of enzymes