1.
Mole concept
How many moles are in 280 g of CaO? (Ca = 40, O = 16)
Answer: B. Moles = mass ÷ molar mass = 280 ÷ 56 = 5 mol.
JAMB UTME Chemistry practice questions
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The UTME is JAMB's computer-based entrance exam for Nigerian universities, polytechnics and colleges of education. You sit Use of English and three other subjects in 2 hours: 60 questions for Use of English and 40 for each other subject.
- 866 questions in our bank
- 14 topics
- Every answer explained
10 free sample questions
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2.
Gas laws
A gas occupies 18 cm³ at 27 °C. Find its volume at 177 °C, pressure remaining constant.
Answer: D. Charles's law uses kelvin: 27 °C = 300 K and 177 °C = 450 K. V₂ = 18 × 450 ÷ 300 = 27 cm³.
3.
Solutions
Express 2 mol/dm³ HCl solution in g/dm³. (H = 1, Cl = 35.5)
Answer: C. Mass concentration = molar concentration × molar mass = 2 × 36.5 = 73 g/dm³.
4.
Electrolysis
A current of 4 A flows for 16 minutes. Find the quantity of electricity passed.
Answer: C. Q = It = 4 × (16 × 60) = 3,840 C (time must be in seconds).
5.
Acids, bases and salts
What is the pH of 0.000001 mol/dm³ hydrochloric acid? (Assume it ionises completely.)
Answer: C. [H⁺] = 0.000001 = 10⁻⁶ mol/dm³, and pH = −log[H⁺] = 6.
6.
Chemical formulae
Calculate the percentage by mass of nitrogen in NH₃. (N = 14, H = 1)
Answer: D. % of nitrogen = (mass of nitrogen in one formula unit ÷ molar mass) × 100 = 82.4%.
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.
Atomic structure
What is the atomic number of carbon?
Answer: B. Carbon has 6 protons, so its atomic number is 6.
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 |