1.
Mole concept
Find the mass of 4 mol of NaOH. (Na = 23, O = 16, H = 1)
Answer: B. Mass = moles × molar mass = 4 × 40 = 160 g.
NECO GCE Chemistry practice questions
Try 10 free Chemistry questions below, each with the answer explained. When you are ready, practise all 866 on a timed CBT screen.
The GCE is the version of the school-leaving exam for private candidates, usually held towards the end of the year. It follows the same syllabus as the May/June exam, with objective and theory papers.
- 866 questions in our bank
- 14 topics
- Every answer explained
10 free sample questions
Tap an answer to check it and see the explanation.
2.
Gas laws
A gas occupies 70 cm³ at a pressure of 700 mmHg. Find its volume at 100 mmHg, temperature remaining constant.
Answer: D. Boyle's law: P₁V₁ = P₂V₂, so V₂ = 700 × 70 ÷ 100 = 490 cm³.
3.
Solutions
Express 2 mol/dm³ Na₂CO₃ solution in g/dm³. (Na = 23, C = 12, O = 16)
Answer: C. Mass concentration = molar concentration × molar mass = 2 × 106 = 212 g/dm³.
4.
Electrolysis
A current of 4 A flows for 12 minutes. Find the quantity of electricity passed.
Answer: C. Q = It = 4 × (12 × 60) = 2,880 C (time must be in seconds).
5.
Acids, bases and salts
What is the pH of 0.0001 mol/dm³ hydrochloric acid? (Assume it ionises completely.)
Answer: B. [H⁺] = 0.0001 = 10⁻⁴ mol/dm³, and pH = −log[H⁺] = 4.
6.
Chemical formulae
Calculate the percentage by mass of carbon in CH₄. (C = 12, H = 1)
Answer: B. % of carbon = (mass of carbon in one formula unit ÷ molar mass) × 100 = 75%.
7.
Gases
A test for ammonia is that the gas
Answer: C. Ammonia turns damp red litmus paper blue.
8.
Organic chemistry
What is the functional group of alkanones?
Answer: C. The functional group of alkanones is C=O within the chain (ketone).
9.
States of matter
A solid changing directly into a gas is called
Answer: C. Sublimation skips the liquid state, e.g. iodine crystals.
10.
Periodic table
Which of these is a noble gas?
Answer: C. Argon is in Group 0 (Group 18), the noble gases.
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Questions in the MyGradePrep bank for each topic.
| Topic | Questions |
|---|---|
| Mole concept | 226 |
| Gas laws | 120 |
| Periodic table | 69 |
| Solutions | 67 |
| Atomic structure | 61 |
| States of matter | 61 |
| Electrolysis | 61 |
| Solubility | 60 |
| Chemical formulae | 40 |
| Organic chemistry | 38 |
| Acids, bases and salts | 18 |
| Redox | 18 |
| Gases | 14 |
| Separation techniques | 10 |