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

Sulphuric acid is

  1. a reducing agent

  2. an oxidising agent

  3. both oxidising and reducing agent

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

Ans : 2.

Multiple choice

Water has pH 7, that means it is

  1. acidic in nature

  2. basic in nature

  3. neutral

  4. pH doesn't tell its nature
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is correct as for neutral solution  the pH is =7.

Multiple choice

Which of the following is the first known acid?

  1. Amino acid

  2. Acetic acid/Ethanoic

  3. Alginic Acidc

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

Acetic acid (found in vinegar) was known to ancient civilizations including Babylonians (around 3000 BCE), who used it in food preservation. It was the first acid systematically documented and used in practical applications. Amino acids were discovered much later (aspartic acid in 1868), and alginic acid was discovered in 1881.

Multiple choice

H2O is

  1. sulphuric acid

  2. water

  3. nitric acid

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

H2O is the chemical formula for water, consisting of two hydrogen atoms bonded to one oxygen atom. Sulphuric acid is H2SO4 and nitric acid is HNO3.

Multiple choice

Acetic acid is present in

  1. vinegar

  2. curd

  3. lime

  4. fish

  5. rancid butter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Vinegar is essentially a solution of acetic acid (typically 5-8% by volume) in water. It is produced through fermentation of ethanol by acetic acid bacteria. Curd contains lactic acid, lime contains citric acid, fish is not characterized by acid content, and rancid butter contains fatty acids from lipid oxidation.

Multiple choice

Which one of the following acids is used in battery?

  1. Hydrochloric acid

  2. Hydrofluoric acid

  3. Sulphuric acid

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

Sulphuric acid is the primary electrolyte used in lead-acid batteries, commonly found in automobiles and UPS systems. It's chosen because it's relatively inexpensive, has good conductivity, and participates in reversible chemical reactions during charging and discharging. Hydrochloric acid would corrode metal components, while hydrofluoric acid is extremely hazardous and attacks glass.

Multiple choice

Which of the following statements is/are false?

a. Non-metal oxides are acidic in nature. b. In pure water, the concentration of hydrogen ions and hydroxide ions are equal. c. The pH of a solution is directly proportional to the concentration of hydrogen ions in it.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. The pH of a solution is inversely proportional to the concentration of hydrogen ions in it.

Multiple choice

Which of the following statements is/are false?

a. The salts of hydrochloric acid are called 'chlorides'. b. A solution of pH 14 will be a weaker base than another solution of pH 10. c. Sulphurous acid is a weak acid because it ionises partially in water to form a small amount of hydrogen ions.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. A solution of pH 14 will be a much more stronger base than another solution of pH 10.

Multiple choice

Which of the following statements is/are false?

a. An ant's sting injects methanoic acid into the skin of a person causing burning pain. b. Antacids are a group of mild bases having no toxic effect on the human body. c. Calcium hydroxide is added to the acidic lake water to neutralise the acid that comes from acid rain.

  1. Only a

  2. Only b and a

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this statement is false. Calcium carbonate is added to the acidic lake water to neutralise the acid that comes from acid rain.