These Chemistry questions for Nursing Entrance exam are all from O’Level topics.
We have also covered each of the Chemistry topic with detailed explanation in our study notes.
Nursing Entrance Chemistry questions
Attempt the questions before checking the correct answer and explanation.
1. Which of the following is a chemical change?
A. Cutting of paper
B. Dissolving sugar in water
C. Boiling of water
D. Burning of candle
SEE (1) ANSWER ✅
Chemical change or reaction forms an entirely new substances and are not easily reversed.
2. Isotopes are atoms of the same element with _____
A. the same mass number but different atomic numbers
B. the same atomic number but different mass numbers
C. different numbers of protons
D. different chemical properties
SEE (2) ANSWER ✅
Isotopes are atoms of the same element with same number of protons (atomic number) but different number of neutrons (mass number).
3. The symbol for the element gold is _____
A. Go
B. Gd
C. Au
D. Ag
SEE (3) ANSWER ✅
- The chemical symbol for gold is derived from its Latin name Aurum (which means “shining dawn”).
- Gd stands for gadolinium.
- Ag for silver.
- Go is not an element symbol.
4. Which of the following compounds contains a double covalent bond?
A. H₂O
B. NH₃
C. O₂
D. NaCl
SEE (4) ANSWER ✅
An oxygen molecule (O2) has 2 oxygen atoms sharing 2 pairs of electrons to complete their octet, forming a double covalent bond (O=O). The other covalent compounds have only single bonds, while NaCl is ionic.
5. Which of the following is an example of a weak base?
A. Sodium hydroxide (NaOH)
B. Potassium hydroxide (KOH)
C. Ammonia solution (NH₃)
D. Calcium hydroxide (Ca(OH)₂)
SEE (5) ANSWER ✅
Ammonia is a weak base because it partially ionizes in water to form hydroxide ions (OH–). Unlike the other options that dissociate completely in aqueous solution.
6. Which of the following is a decomposition reaction?
A. 2H₂ + O₂ → 2H₂O
B. 2H₂O → 2H₂ + O₂
C. NaOH + HCl → NaCl + H₂O
D. Fe + S → FeS
SEE (6) ANSWER ✅
A decomposition reaction is when a single compound breaks down into 2 or more simpler substances. Like, water (H2O) to hydrogen and oxygen gas.
7. Which of the following is used as a disinfectant and antiseptic?
A. Methane
B. Ethanol
C. Propane
D. Butane
SEE (7) ANSWER ✅
Ethanol (ethyl alcohol) is used because it kills micro-organisms by denaturing their proteins and dissolving their lipid membranes. Other options are primarily used as fuels.
8. Temporary hardness in water can be removed by _____
A. adding salt
B. boiling
C. filtering
D. adding acid
SEE (8) ANSWER ✅
Temporary hardness in water is caused by dissolved calcium hydrogen carbonate Ca(HCO3)2 or magnesium hydrogen carbonate Mg(HCO3)2. Boiling the water decomposes these soluble hydrogen carbonates into insoluble carbonates (precipitating out as limescale).
Which of the following is used to test for the presence of starch?
A. Benedict's solution
B. Iodine solution
C. Fehling's solution
D. Lime water
SEE (9) ANSWER ✅
When a few drops of iodine solution (yellowish-brown) are added to a sample containing starch, it turns to a distinct blue-black colour. Options (A) and (C) tests for reducing sugar while (D) tests for CO2
10. The process used to separate two miscible liquids with different boiling points is _____
A. filtration
B. fractional distillation
C. crystallisation
D. chromatography
SEE (10) ANSWER ✅
Miscible liquids completely dissolve into one another but with different boiling points, like ethanol and water. So when heated, the one with lower boiling point vaporizes first through a fractionating column and cools back to its liquid state now separate from the other.
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