Grade 11 Chemistry practice questions – Lebanese curriculum

Q: Where do these Grade 11 Chemistry questions come from?

They are a sample from EduRise's Grade 11 Chemistry question bank (728 questions across 7 chapters), written to follow the Lebanese curriculum. Each chapter on EduRise has its own practice set and a timed exam.

Q: Are the answers explained?

Yes. Every question on EduRise shows the correct answer and an explanation after you answer, in practice mode and in the exam review.

Q: How do I get the full question bank?

Register at edurise.me and subscribe ($10/month) to practise every chapter of Grade 11 Chemistry, take the timed exams and track your progress.

Question 1

The blue colour of a copper(II) sulfate solution is due to:

Accepted Answer

the Cu²⁺ ions. Cu²⁺(aq) is blue; SO₄²⁻ is colourless.

Question 2

An oxidant is a species that:

Accepted Answer

gains electrons. The oxidant captures electrons and is reduced.

Question 3

In the external circuit, the current goes from the + pole to the − pole.

Accepted Answer

True. True: the current is opposite to the electrons, which go − → +.

Question 4

In a galvanic cell, oxidation takes place at:

Accepted Answer

the anode. Anode = oxidation (− pole); cathode = reduction (+ pole).

Question 5

The oxidation number of oxygen in most compounds is:

Accepted Answer

−2. O = −2 in oxides, water, ions such as SO₄²⁻; −1 only in peroxides.

Question 6

Which couple contains iodine and iodide?

Accepted Answer

I₂/I⁻. Couples are written Ox/Red: I₂ is the oxidised form.

Question 7

The colour of the first excess of permanganate in the Erlenmeyer is:

Accepted Answer

pink. Very dilute MnO₄⁻ looks pink.

Question 8

At equivalence, C(Fe²⁺) × V(Fe²⁺) = C(MnO₄⁻) × V_E.

Accepted Answer

False. False: n(Fe²⁺) = 5 n(MnO₄⁻) from the balanced equation.

Question 9

In elemental analysis, how is the mass percentage of oxygen usually obtained?

Accepted Answer

by difference: %O = 100 − (%C + %H + …). Oxygen has no simple direct test: it is the rest after the other elements are measured.

Question 10

Heated with soda lime, a compound releases a gas that turns moist red litmus paper blue. Which element does the compound contain?

Accepted Answer

nitrogen. The gas is ammonia NH₃ (basic), formed from the nitrogen of the compound.

Question 11

Butane and 2-methylpropane are isomers.

Accepted Answer

True. True: both are C₄H₁₀ with different skeletons (chain isomers).

Question 12

What is the general formula of the alkanes?

Accepted Answer

CₙH₂ₙ₊₂. Alkanes contain only single bonds: CₙH₂ₙ₊₂ (methane CH₄, ethane C₂H₆).

Question 13

Which catalyst is used for the hydrogenation of an alkene?

Accepted Answer

nickel (Ni). CₙH₂ₙ + H₂ → CₙH₂ₙ₊₂ over heated nickel (or Pt).

Question 14

The hydration of propene gives mainly propan-2-ol.

Accepted Answer

True. True: Markovnikov's rule — H goes to CH₂, OH to the middle carbon.

Grade 11 Chemistry Questions and Answers

14 Grade 11 Chemistry practice questions

1. The blue colour of a copper(II) sulfate solution is due to:

2. An oxidant is a species that:

3. In the external circuit, the current goes from the + pole to the − pole.

4. In a galvanic cell, oxidation takes place at:

5. The oxidation number of oxygen in most compounds is:

6. Which couple contains iodine and iodide?

7. The colour of the first excess of permanganate in the Erlenmeyer is:

8. At equivalence, C(Fe²⁺) × V(Fe²⁺) = C(MnO₄⁻) × V_E.

9. In elemental analysis, how is the mass percentage of oxygen usually obtained?

10. Heated with soda lime, a compound releases a gas that turns moist red litmus paper blue. Which element does the compound contain?

11. Butane and 2-methylpropane are isomers.

12. What is the general formula of the alkanes?

13. Which catalyst is used for the hydrogenation of an alkene?

14. The hydration of propene gives mainly propan-2-ol.

More practice

About these questions

Practise all Grade 11 Chemistry questions