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

Which of the following is a mineral acid?

  1. Formic acid

  2. Amino acid

  3. Malic acid

  4. Nitric acid

  5. Acetic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An acid that is prepared from the minerals of the Earth is called as mineral acid. Nitric acid is a mineral acid.

Multiple choice

Which of the following is an organic acid?

  1. Hydrochloric acid

  2. Sulphuric acid

  3. Phosphoric acid

  4. Oxalic acid

  5. Boric acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Oxalic acid is an organic acid. It is used in various ways such as a rust remover, a cleaning agent on wood working, as stain lifter and as bleaching agent.

Multiple choice

Match the following acids with their formulae:

1. Phosphoric acid a. HCL
2. Nitric acid b. H3PO4
3. Hydrochloric acid c. H2SO4
4. Sulphuric acid d. HNO3

  1. 1 - b, 2 - a, 3 - d, 4 - c

  2. 1 - c, 2 - d, 3 - a, 4 - b

  3. 1 - d, 2 - b, 3 - a, 4 - c

  4. 1 - b, 2 - d, 3 - c, 4 - a

  5. 1 - b, 2 - d, 3 - a, 4 - c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. The formula of phosphoric acid is H3PO4 The formula of nitric acid is HNO3 The formula of hydrochloric acid is HCL The formula of sulphuric acid is H2SO4

Multiple choice

Which of the following pair of ‘compounds - their respective nature’ is not correctly matched?

  1. Carbon dioxide - acidic

  2. SiO2 - acidic

  3. Alumina - Amphoteric

  4. Caro’s acid - dibasic

  5. Sulphuric acid - dibasic
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Caro’s acid (H2SO5) is monobasic on account of the presence of one replaceable hydrogen atom. The presence of one replaceable hydrogen atom is explained by the example of potassium peroxymonosulfate (KHSO5) which is formed by the reaction of H2SO5 with alkali. It is the potassium acid salt of peroxymonosulphuric acid and is widely used as an oxidising agent.

Multiple choice

Water is

  1. acidic

  2. basic

  3. neutral

  4. none of these

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pure water has a pH of 7 at 25 degrees Celsius, which is defined as neutral. It is neither acidic nor basic.

Multiple choice

Which of the following is not a property of acids?

  1. Acids have a sour taste.

  2. All acid solutions are good conductors of electricity.

  3. They turn blue litmus solution red.

  4. Most of the acids are insoluble in water.

  5. Mineral acids are highly corrosive.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Most of the acids are soluble in water.

Multiple choice

Which of the following oil is known as oil of vitriol?

  1. Sulphuric acid

  2. Nitric acid

  3. Hydrochloric acid

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

Oil of vitriol is an archaic name for concentrated sulphuric acid. This name originated from its oily appearance and its production from vitriols.

Multiple choice

Which of the following statements are true? A. Number of replaceable hydroxyl ions present in one molecule of a base is called its acidity. B. Benzoic acid can be extracted from water using ethyl alcohol. C. In column chromatography more highly absorbed component is eluted with less polar solvents.

  1. Only A

  2. Only B

  3. Only C

  4. Only A and B

  5. Only B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because number of replaceable hydroxyl ions present in one molecule of a base is called its acidity, is a true statement.

Multiple choice

Sodium hydrogenperoxide is formed by the reaction between

  1. alcohol and oxone

  2. carbon monoxide and dry oxone

  3. oxone and water

  4. oxone and carbon dioxide

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

This option is correct because when  Na2O2 is treated with absolute alcohol at 00C,  a white powder of sodium hydrogenperoxide is formed.

Multiple choice

Amino acids are

  1. acids

  2. bases

  3. amphoteric

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

Ans : 3.

Multiple choice

Considering acid-base regulation in the body, which of the following statements are true?

  1. Overall human metabolism results in acid production.

  2. Buffers must be strong acids or bases.

  3. Carbon dioxide directly raises the pH of body fluids.

  4. The pH of a buffer solution is always 7.0.

  5. A decrease in the plasma level of bicarbonate ions (HCO3-) will directly raise the pH of plasma.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Overall, the body is a net producer of acid and a major function of the kidney is to excrete this acid load. A large change in body pH cannot be tolerated as it will have adverse effects on cellular function.