Welcome to Inamjazbi Learn Chemistry! 🎉 This ultimate Class 11 Chemistry MCQs test covers Acids, Bases and Salts . Test your knowledge with interactive questions, get instant feedback on each answer, and see your final score at the end! 🧠Keep track of your score and challenge yourself!Whether you are preparing for exams or just love Chemistry, this quiz is perfect for sharpening your concepts. Ready, set, answer! ⚡
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🔥🌟 Grand Chemistry Interactive MCQs Quiz Test on Acids, Bases and Salts for Class FSC/MDCAT/ECAT Set I 🧪💡 | Learn & Practice!
1. H₂SO₄ is stronger acid than CH₃COOH because:
a) It gives two H⁺ ion per molecule
b) Its boiling point is high
c) Its degree of ionization is high
d) It is highly corrosive
✅ Correct Answer: (c)
The strength of an acid depends upon its degree of ionization and acid ionization constant (Kₐ). Greater the value of degree of ionization (equal or greater than 30%) and Kₐ (more than 10⁻³), stronger is the acid. The degree of ionization of H₂SO₄ is quite high about 60% (first step) and its Kₐ is also quite high about 10³ (Kₐ₂ for HSO₄⁻ = 1.3 x 10⁻²) showing that it is a very strong acid. Contrarily, The degree of ionization of CH₃COOH is quite low about 1.4% and its Ka is also quite low about 1.7 x 10⁻⁵ showing that it is a weaker acid than H₂SO₄.
The strength of an acid depends upon its degree of ionization and acid ionization constant (Kₐ). Greater the value of degree of ionization (equal or greater than 30%) and Kₐ (more than 10⁻³), stronger is the acid. The degree of ionization of H₂SO₄ is quite high about 60% (first step) and its Kₐ is also quite high about 10³ (Kₐ₂ for HSO₄⁻ = 1.3 x 10⁻²) showing that it is a very strong acid. Contrarily, The degree of ionization of CH₃COOH is quite low about 1.4% and its Ka is also quite low about 1.7 x 10⁻⁵ showing that it is a weaker acid than H₂SO₄.
2. Which of the following statements is not correct about the bases?
a) They have bitter tastes
b) They have high pH value
c) They react with acids to form salts
d) They turn blue litmus red
✅ Correct Answer: (d)
Bases turns red litmus paper blue.
Bases turns red litmus paper blue.
3. Al₂O₃ is amphoteric oxide because it reacts with:
a) Acids
b) neither acid nor base
c) Both acids and base
d) Base
✅ Correct Answer: (c)
👉Amphoteric oxides have dual characteristics of acid and base and hence they react both with acid and base through neutralization forming salt and water. 👉The oxides of amphoteric metals like Be, Al, Sn, Pb, Zn, Cr etc. are amphoteric . These oxides react with both acids and base via neutralization to form salt and water. 👉Al₂O₃, ZnO, BeO, SnO, SnO₂, PbO, PbO₂, Cr₂O₃ are amphoteric oxides.
👉Amphoteric oxides have dual characteristics of acid and base and hence they react both with acid and base through neutralization forming salt and water. 👉The oxides of amphoteric metals like Be, Al, Sn, Pb, Zn, Cr etc. are amphoteric . These oxides react with both acids and base via neutralization to form salt and water. 👉Al₂O₃, ZnO, BeO, SnO, SnO₂, PbO, PbO₂, Cr₂O₃ are amphoteric oxides.
4. Which of the following is not a buffer solution?
a) Na₂CO₃ /NaHCO₃
b) CH₃COOH/CH₃COONa
c) NH₄OH/NH₄Cl
d) NaOH/HCl
✅ Correct Answer: (d)
Buffer solution is a mixture of weak acid and its salt with strong base or weak base and its salt with strong base. In option ‘d’, NaOH and HCl are both base and acid.
Buffer solution is a mixture of weak acid and its salt with strong base or weak base and its salt with strong base. In option ‘d’, NaOH and HCl are both base and acid.
5. Which oxide is amphoteric in nature:
a) K₂O
b) CO₂
c) Al₂O₃
d) CaO
✅ Correct Answer: (c)
👉The oxides of amphoteric metals like Be, Al, Sn, Pb, Zn, Cr etc are amphoteric . These oxides react with both acids and base via neutralization to form salt and water. Al₂O₃, ZnO, BeO, SnO, SnO₂, PbO, PbO₂, Cr₂O₃ are amphoteric oxides. 👉The oxides of metals like K₂O, Li₂O, Na₂O, MgO, CaO, BaO etc. are basic. 👉The oxides of non-metals like CO₂, SO₂, SO₃, NO₂, N₂O₂, P₂O₃, P₂O₅, Cl₂O, Cl₂O₇ etc. are acidic. (Some non-metallic oxides like H₂O, N₂O, NO and CO are neutral).
👉The oxides of amphoteric metals like Be, Al, Sn, Pb, Zn, Cr etc are amphoteric . These oxides react with both acids and base via neutralization to form salt and water. Al₂O₃, ZnO, BeO, SnO, SnO₂, PbO, PbO₂, Cr₂O₃ are amphoteric oxides. 👉The oxides of metals like K₂O, Li₂O, Na₂O, MgO, CaO, BaO etc. are basic. 👉The oxides of non-metals like CO₂, SO₂, SO₃, NO₂, N₂O₂, P₂O₃, P₂O₅, Cl₂O, Cl₂O₇ etc. are acidic. (Some non-metallic oxides like H₂O, N₂O, NO and CO are neutral).
6. Which of the following does not alter the pH of a solution?
a) NH₄Cl
b) Na₂CO₃
c) NaCl
d) Mg(OH)Cl
✅ Correct Answer: (c)
Neutral salts formed from strong acids and strong bases like NaCl, KBr, KCl, BaCl₂, Na₂SO₄, KNO₃ etc. do not change the pH of solution.
Neutral salts formed from strong acids and strong bases like NaCl, KBr, KCl, BaCl₂, Na₂SO₄, KNO₃ etc. do not change the pH of solution.
7. Conjugated acids of NH₃ is:
a) NH₄⁺
b) NH₂⁻
c) NH₂
d) NH
✅ Correct Answer: (a)
👉To form conjugate acid from a compound or ion, just add H into it while to form conjugate base of a compound or ion just remove H from it. Don’t forget to balance charge either adding or subtracting H. 👉Addition of H increases one unit + charge while removing of H decreases one + charge. 👉NH₃ (adding add H into it will introduce + charge) …………… NH₄⁺ (conjugate acid) 👉NH₃ (removing H from it will introduce – charge) ……………. NH₂⁻ (conjugate base)
👉To form conjugate acid from a compound or ion, just add H into it while to form conjugate base of a compound or ion just remove H from it. Don’t forget to balance charge either adding or subtracting H. 👉Addition of H increases one unit + charge while removing of H decreases one + charge. 👉NH₃ (adding add H into it will introduce + charge) …………… NH₄⁺ (conjugate acid) 👉NH₃ (removing H from it will introduce – charge) ……………. NH₂⁻ (conjugate base)
8. Salt which is formed by the neutralization of weak acid and strong base is:
a) NaNO₃
b) NH₄Cl
c) Na₂CO₃
d) NH₄CN
✅ Correct Answer: (c)
👉Strong bases contain Na⁺, K⁺, Ba²⁺ as cation while weak acids contains anions other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. 👉A salt formed from weak acid and strong base via neutralization contains any one of the cation like Na⁺, K⁺, Ba²⁺ and anion other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. 👉Sodium carbonate (Na₂CO₃) is a salt derived from the neutralization of weak acid (H₂CO₃ containing CO₃²⁻ anion) and strong base (NaOH).
👉Strong bases contain Na⁺, K⁺, Ba²⁺ as cation while weak acids contains anions other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. 👉A salt formed from weak acid and strong base via neutralization contains any one of the cation like Na⁺, K⁺, Ba²⁺ and anion other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. 👉Sodium carbonate (Na₂CO₃) is a salt derived from the neutralization of weak acid (H₂CO₃ containing CO₃²⁻ anion) and strong base (NaOH).
9. A conjugate acid base pair has the difference of only:
a) One electron
b) One proton
c) One electron pair
d) One proton pair
✅ Correct Answer: (b)
👉Conjugate acid-base pair differs from one another only by a single proton (H⁺). 👉To identify a conjugate acid base pair, we look at the specie that donates a proton and the specie that is formed from it by the loss of proton. 👉In the given reaction between HCl and NH₃, NH₃ accepts a proton acting as a Bronsted base to form NH₄⁺ which is its conjugate acid. Similarly, HCl donates a proton acting as a Bronsted acid to form Cl⁻ which is its conjugate base.
👉Conjugate acid-base pair differs from one another only by a single proton (H⁺). 👉To identify a conjugate acid base pair, we look at the specie that donates a proton and the specie that is formed from it by the loss of proton. 👉In the given reaction between HCl and NH₃, NH₃ accepts a proton acting as a Bronsted base to form NH₄⁺ which is its conjugate acid. Similarly, HCl donates a proton acting as a Bronsted acid to form Cl⁻ which is its conjugate base.
10. Salt formed by neutralization of weak acid and weak base is:
a) NH₄Cl
b) Na₂CO₃
c) NH₄CN
d) Na₂SO₄
✅ Correct Answer: (c)
Strong bases contain Na⁺, K⁺, Ba²⁺ as cation while weak acids contains anions other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. A salt formed from weak acid and weak base via neutralization contains any cation other Na⁺, K⁺, Ba²⁺ and any anion other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. Ammonium cyanide (NH₄CN) is a salt derived from the neutralization of weak acid (HCN containing CN⁻ anion) and weak base (NH₄OH).
Strong bases contain Na⁺, K⁺, Ba²⁺ as cation while weak acids contains anions other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. A salt formed from weak acid and weak base via neutralization contains any cation other Na⁺, K⁺, Ba²⁺ and any anion other than Cl⁻, Br⁻, I⁻, NO₃⁻, SO₄²⁻, ClO₄⁻, and ClO₃⁻. Ammonium cyanide (NH₄CN) is a salt derived from the neutralization of weak acid (HCN containing CN⁻ anion) and weak base (NH₄OH).
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Aptitude test (MDCAT/ECAT)
Bases and Salts
Bases and Salts MCQs
Bases and Salts Quiz
ECAT Chemistry
First year
High-Yield Acids
MDCAT Acids
MDCAT ECAT FSC Chemistry Acids