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

What is formed when an acid and base react?

  1. An acid and a salt

  2. A salt and some water

  3. Breakfast!

  4. A base and a salt
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A neutralization reaction occurs between an acid and a base, which produces a salt and water. This is a fundamental reaction type in chemistry.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Acid rain is a mixture of:

  1. sulphuric acid with hydrochloric acid and nitric acid with nitrous acid

  2. sulphuric acid with sulphurous acid and nitric acid with hydrochloric acid

  3. sulphuric acid with sulphurous acid and nitric acid with nitrous acid

  4. sulphuric acid with nitrous acid and nitric acid with sulphurous acid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When oxides of sulphur and nitrogen emitted by the industries, react with the moisture present in the atmosphere they form acids.

The acids formed by sulphur oxides are sulphuric acid with sulphurous acid and the acids formed by nitrogen oxides are nitric acid with nitrous acid.
These acids are responsible for the acidity of rains. The pH of acid rain is 5.5
Thus, the correct answer is option (C).

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Why non-metallic oxides are mostly acidic?

  1. they readily accept proton.

  2. they are bitter in taste.

  3. they readily lose proton.

  4. None of above.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The addition of water to a non-metal oxide results in a compound that consists of a non-metal atom surrounded by oxo ($=O$) and hydroxyl ($-OH$) groups. 

Such a molecule readily loses a proton from one of its hydroxyl groups because the resulting anion is highly stabilized by the oxygen atoms and the electronegative non-metal atom. Therefore, they are acidic. 

Multiple choice chemistry acids, bases and salts metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Identify acidic salt which can react with one mole of base among the following.

  1. $(NH _{4}) _{2}CO _{3}$
  2. $Na _{2}HPO _{3}$
  3. $NaH _{2}PO _{3}$
  4. $CH _{3}COOK$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$H _3PO _3$ is a dibasic acid. In its structure, one oxygen atom is bonded to $P-$ atom via a double bond. $2$ $O-$atoms are bonded to $H-$atoms causing acidity. The third $H$ is directly attached to $P-$ atom responsible for its reducing behavior. 

In $NaH _2PO _3$, one acidic $H$ is replaced by $Na$. Only one $H$ is left which causes the acidic behavior in the salt and hence, will react with one mole of base. 

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

The solution of KOH is 

  1. acidic in nature.

  2. basic in nature.

  3. neutral in nature.

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

The solution of KOH is  basic in nature.
KOH is strong electrolyte and completely dissociates in aqueous solution to provide hydroxide ions. Due to this, aqueous KOH solution is strong alkali.
$\displaystyle KOH \rightarrow K^+ + OH^-$

Multiple choice chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

Sulphurous acid is a _________ acid.

  1. dibasic

  2. strong

  3. tribasic

  4. both a and b
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sulphurous acid is produced by dissolving sulphur dioxide in water. It is a weak dibasic acid known in the form of its salts e.g. sodium sulphite. It is unstable has has never been isolated as a pure compound.
$2NaOH+{ SO } _{ 2 }\rightarrow { { Na } _{ 2 }SO } _{ 3 }+{ H } _{ 2 }O$

Multiple choice chemistry nitrogen and sulfur sulfur and its oxides acid deposition natural resources- air, water and land

Which of the following acts as pickling agent?

  1. $\displaystyle\;HNO _3$
  2. $\displaystyle\;HCl$
  3. $\displaystyle\;H _2SO _4$
  4. $\displaystyle\;HNO _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pickling is a metal surface treatment i.e; used to remove impurities such as strains, inorganic contaminants on the surface of the metal. So to remove this pickling liquor containing acid is used. 

$H _2SO _4$ is used as pickling agent because of its high oxidizing power, for which it can dissolve noble metals as well.

Multiple choice chemistry nitrogen and sulfur ammonia and fertilizers preparation of ammonia-laboratory method and haber's process ammonia

In which reaction ammonia acts as an acid?

  1. ${NH} _{3}+HCl\rightarrow {NH} _{4}Cl$
  2. ${NH} _{3}+{H}^{+}\rightarrow {NH} _{4}^{+}$
  3. ${NH} _{3}+Na\rightarrow Na{NH} _{2}+\cfrac{1}{2}{H} _{2}$
  4. ${NH} _{3}$ cannot act as an acid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$NH _3$  is a strong base due to high electron density on nitrogen 

So, it cannot act as an acid .

Multiple choice

What is the most common type of titration?

  1. Acid-base titration

  2. Redox titration

  3. Precipitation titration

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

Acid-base titration is the most common type of titration because it is used to determine the concentration of acids and bases.