Chemistry

Acids and Bases

594 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 chemistry chemical equilibrium and acids-bases dissociation constants ionisation of weak acids and weak bases ionization constants of weak acids and weak bases

How both the acids $\displaystyle HCl$ and $\displaystyle { HC } _{ 2 }{ H } _{ 3 }{ O } _{ 2 }$ are different?

  1. The first has less hydrogen in solution

  2. The second is highly ionized

  3. The second has more ionized hydrogen

  4. The first is highly ionized
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HCl undergoes complete ionization as it is a strong acid.
On the other hand, acetic acid  $HC _2H _3O _2$ is a weak acid and is ionized to a small extent.

Multiple choice chemistry further aspects of equilibria dissociation constants ionisation of weak acids and weak bases ionization constants of weak acids and weak bases

When strong base $(NaOH)$ is added to the weak acid (acetic acid, ${ CH } _{ 3 }COOH$), then dissociation of acetic acid increases; this effect is known as:

  1. Common ion effect

  2. Reverse ion effect

  3. Saltation effect

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

$CH _3COOH\rightleftharpoons CH _3COO^{-}+H^+$
When $NaOH$ is added $H^+$ combines with $OH^{-}$ so concentration of $H^+$ decreases so equilibrium will shift towards right.
${ CH } _{ 3 }COOH+NaOH\longrightarrow { CH } _{ 3 }COONa+{ H } _{ 2 }O\quad $
Ionization of acetic acid will increase with the progress of its neutralization. This effect is called reverse ion effect.

Multiple choice group 17 elements - trends in chemical properties group 17 elements - properties p- block elements-ii p-block elements chemistry

Which of the following is most acidic?

  1. $HClO$
  2. $HClO _2$
  3. $HClO _3$
  4. $HClO _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the oxidation number of chlorine(non metal) increases in the given acids the acidic nature of the compound increases. So the oxidation numbers of chlorine in the given compounds are $+1,+3,5,+7$ respectively.

So the acidic nature of $HClO _4$ is high.
Hence option D is correct.

Multiple choice chemistry chemistry in daily life antimicrobials and antifertility drugs therapeutic action of different classes of drugs drugs and their classification

Protonsil is converted to a compound called:

  1. sulphapyridine

  2. arsphenamine

  3. salvarsan

  4. sulphanilamide
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Protonsil also called as sulfamido chrysoine is first synthetic drug used in treatment of general bacterial infections in humans. Protonsil converts into sulfoamide in the body which prevent bacterial infection.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Acidic oxides react with water to give ________.

  1. base

  2. acids

  3. salt

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Acids are formed by reacting acidic oxides with water. $CO _2$ is acidic oxide. On reacting it with water, $H _2CO _3$, which is an acid forms.
$CO _2 + H _2O \rightarrow H _2CO _3$
                                 $acid$
Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen

Which of the following is the most acidic?

  1. ${ P } _{ 2 }{ O } _{ 5}$
  2. ${ N } _{ 2 }{ O } _{ 5 }$
  3. ${ Sb } _{ 2 }{ O } _{ 5 }$
  4. ${ As } _{ 2 }{ O } _{ 5 }$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As the electronegativity value of the element increases. the acidic character of the oxide also increases.

Here among $N,P,SI$ and $As$ the most electronegative is $N$.

Thus the most acidic is $N _2O _5$.

Multiple choice chemistry chemistry of non-metals oxides of elements simple oxides oxygen
Amphoteric species is:
  1. $Na _3PO _4$
  2. $HSO _4^-$
  3. $KOH$
  4. $HNO _3$
  5. $C _2O^{2-} _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amphoteric specie is $\displaystyle HSO _4^-$.
It reacts with acid as well as base.
$\displaystyle HSO _4^- + H^+ \rightarrow H _2SO _4$
$\displaystyle HSO _4^-+ OH^- \rightarrow SO _4^{2-} + H _2O$