- No data uploaded
- Instant results
KCET Chemistry Questions
Practise chemistry (science) for the Karnataka Common Entrance Test: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Chemistry practice
-
Q1.Which element is liquid at room temperature?
Show answer & explanation
Answer: B — Mercury
Mercury (and bromine) are liquids at room temperature.
-
Q2.What is the mass of 1 mol of sodium chloride (NaCl)? (Molar mass 58.5 g/mol)
Show answer & explanation
Answer: A — 58.5 g
Mass = moles × molar mass = 1 × 58.5 g/mol = 58.5 g.
-
Q3.The periodic table is arranged in order of increasing:
Show answer & explanation
Answer: D — Atomic number
The modern periodic table orders elements by atomic number.
-
Q4.What is the pH of a solution with [OH⁻] = 10⁻⁴ mol/L at 25 °C?
Show answer & explanation
Answer: B — 10
[OH⁻] = 10⁻⁴ → pOH = 4; pH = 14 − 4 = 10 (at 25 °C).
-
Q5.Which gas is responsible for most of the greenhouse effect from human activity?
Show answer & explanation
Answer: A — Carbon dioxide
CO₂ from burning fossil fuels is the largest human-caused contributor.
-
Q6.10 g of KCl (molar mass 74.5) is dissolved to make 1000 mL of solution. Find the molarity.
Show answer & explanation
Answer: D — 0.134 M
Moles = 10/74.5 = 0.134; molarity = moles ÷ litres = 0.134 ÷ 1 = 0.134 M.
-
Q7.Rusting of iron requires:
Show answer & explanation
Answer: D — Both oxygen and water
Iron rusts in the presence of oxygen and moisture, forming hydrated iron(III) oxide.
-
Q8.What is the mass of 4 mol of sodium chloride (NaCl)? (Molar mass 58.5 g/mol)
Show answer & explanation
Answer: C — 234 g
Mass = moles × molar mass = 4 × 58.5 g/mol = 234 g.
-
Q9.The process of converting a solid directly into a gas is called:
Show answer & explanation
Answer: B — Sublimation
Sublimation, e.g. dry ice or naphthalene.
-
Q10.What is the mass of 4 mol of ammonia (NH₃)? (Molar mass 17 g/mol)
Show answer & explanation
Answer: B — 68 g
Mass = moles × molar mass = 4 × 17 g/mol = 68 g.
How to approach chemistry questions
Moles = mass ÷ molar mass; molarity = moles ÷ litres. pH = −log[H⁺] and pH + pOH = 14 at 25 °C. For concepts, link each property to its position in the periodic table.
About KCET
Karnataka Common Entrance Test — conducted by Karnataka Examinations Authority (KEA). State entrance for professional courses in Karnataka.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
KCET practice topics
| Topic | Section | Question source |
|---|---|---|
| Algebra | Mathematics | Calculated (new numbers every set) |
| Geometry & Mensuration | Mathematics | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Biology | Science | Question bank |