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Chemistry MCQs

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Which process is used to separate crude oil into useful fractions based on different boiling points?

A Fractional distillation
B Chromatography
C Crystallisation
D Filtration

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Correct Answer: Option A — Fractional distillation

Explanation: Fractional distillation separates crude oil into fractions with different boiling points in a fractionating column producing petrol kerosene diesel lubricating oil and bitumen.

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Which isotope of carbon is used in radiocarbon dating?

A Carbon-12
B Carbon-13
C Carbon-11
D Carbon-14

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Correct Answer: Option D — Carbon-14

Explanation: Carbon-14 is a radioactive isotope used in radiocarbon dating of organic materials because it decays at a known rate allowing scientists to estimate the age of ancient samples.

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Which scientific law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules?

A Boyle's Law
B Gay-Lussac's Law
C Avogadro's Law
D Charles's Law

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Correct Answer: Option C — Avogadro's Law

Explanation: Avogadro's Law states that equal volumes of all gases at the same temperature and pressure contain equal numbers of molecules regardless of the nature of the gas.

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Which element is essential for the structure of DNA and RNA molecules alongside carbon hydrogen oxygen and nitrogen?

A Sulfur
B Calcium
C Iron
D Phosphorus

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Correct Answer: Option D — Phosphorus

Explanation: Phosphorus is a key element in DNA and RNA molecules forming the phosphate backbone of the double helix structure and is also essential in ATP the cell's energy currency.

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Medium css Uploaded: 06 Aug 2026

Which of the following is an alkali metal?

A Potassium
B Calcium
C Magnesium
D Aluminum

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Correct Answer: Option A — Potassium

Explanation: Potassium is an alkali metal found in group 1 of the periodic table. Alkali metals are highly reactive, soft, and have a single electron in their outer shell, which they readily lose to form positive ions.

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What is the chemical name for rust?

A Iron nitrate
B Iron sulfide
C Iron carbonate
D Iron oxide

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Correct Answer: Option D — Iron oxide

Explanation: Rust is chemically known as iron oxide, formed when iron reacts with oxygen and moisture in the air over time. This process, called oxidation, weakens the structural integrity of iron and steel objects.

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What is the strongest type of intermolecular force?

A Van der Waals forces
B Dipole-dipole forces
C Hydrogen bonding
D London dispersion forces

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Correct Answer: Option C — Hydrogen bonding

Explanation: Hydrogen bonding is the strongest type of intermolecular force, occurring when hydrogen is bonded to highly electronegative atoms like oxygen, nitrogen, or fluorine. It significantly affects boiling points and solubility of compounds.

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Which of these is a strong base?

A Sodium hydroxide
B Ammonia
C Acetic acid
D Carbonic acid

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Correct Answer: Option A — Sodium hydroxide

Explanation: Sodium hydroxide is a strong base that fully dissociates in water to release hydroxide ions. It is widely used in soap making, paper production, and various industrial cleaning applications due to its high reactivity.

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Which type of reaction in organic chemistry involves replacing a hydrogen atom with another atom or group?

A Elimination
B Substitution
C Addition
D Hydrolysis

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Correct Answer: Option B — Substitution

Explanation: Substitution reactions replace one atom or group in a molecule with another as seen when chlorine substitutes hydrogen in methane under UV light producing chloromethane.

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Which type of chemical formula shows the simplest whole number ratio of atoms in a compound?

A Molecular formula
B Structural formula
C Displayed formula
D Empirical formula

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Correct Answer: Option D — Empirical formula

Explanation: An empirical formula shows the simplest whole number ratio of each type of atom in a compound for example glucose C6H12O6 has the empirical formula CH2O.

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What is the term for the minimum energy needed to start a chemical reaction?

A Ionization energy
B Lattice energy
C Bond energy
D Activation energy

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Correct Answer: Option D — Activation energy

Explanation: Activation energy represents the minimum energy barrier that reactant molecules must overcome to transform into products during a chemical reaction. Catalysts function by lowering this energy requirement to speed up reactions.

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Which process involves passing an electric current through a solution to cause a chemical reaction?

A Electrolysis
B Distillation
C Chromatography
D Filtration

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Correct Answer: Option A — Electrolysis

Explanation: Electrolysis passes an electric current through an electrolyte solution or molten ionic compound causing chemical reactions at the electrodes and is used to extract metals and plate surfaces.

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Which organic functional group is present in carboxylic acids?

A Hydroxyl group
B Carboxyl group COOH
C Carbonyl group
D Amino group

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Correct Answer: Option B — Carboxyl group COOH

Explanation: The carboxyl group COOH is the functional group present in all carboxylic acids and is responsible for their acidic properties as it can donate a proton to a base.

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What is saponification in chemistry?

A Making soap by reacting fats with a strong alkali
B Conversion of oils to alcohol
C Adding hydrogen to unsaturated fats
D Making esters from acids and alcohols

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Correct Answer: Option A — Making soap by reacting fats with a strong alkali

Explanation: Saponification is the process of making soap by reacting fats or oils with a strong alkali such as sodium hydroxide producing glycerol and soap molecules.

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What is the term for a solution that resists changes in pH?

A Saturated solution
B Buffer solution
C Colloid
D Suspension

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Correct Answer: Option B — Buffer solution

Explanation: A buffer solution resists significant changes in pH when small amounts of acid or base are added. Buffers are essential in biological systems, such as maintaining stable blood pH within a narrow, life-sustaining range.

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What is the chemical formula for ethanoic acid commonly found in vinegar?

A CH3COOH
B HCOOH
C CH3CH2COOH
D C3H7COOH

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Correct Answer: Option A — CH3COOH

Explanation: Ethanoic acid has the formula CH3COOH and is the simplest carboxylic acid after methanoic acid found in vinegar at 4-8 percent concentration giving it its sour taste.

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What is the general formula of alkanes where n is the number of carbon atoms?

A CnH2n
B CnH2n+2
C CnHn
D CnH2n-2

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Correct Answer: Option B — CnH2n+2

Explanation: Alkanes follow the general formula CnH2n plus 2 where each carbon forms four single bonds and the molecule is fully saturated with hydrogen atoms.

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Which element is liquid at room temperature and is the only non-metal element in this state?

A Mercury
B Bromine
C Gallium
D Caesium

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Correct Answer: Option B — Bromine

Explanation: Bromine is the only non-metal element that exists as a liquid at room temperature appearing as a reddish-brown volatile liquid with a pungent irritating smell.

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What is an isotope?

A Atoms of different elements with the same mass
B Atoms of the same element with different numbers of protons
C Atoms of the same element with the same number of protons but different neutrons
D Atoms of different elements with the same electrons

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Correct Answer: Option C — Atoms of the same element with the same number of protons but different neutrons

Explanation: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons resulting in different mass numbers but similar chemical properties.

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Medium css Uploaded: 06 Aug 2026

What is the pH range of a strong acid?

A 11-14
B 4-6
C 7
D 0-3

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Correct Answer: Option D — 0-3

Explanation: Strong acids typically have a pH range of 0 to 3, indicating a high concentration of hydrogen ions in solution. Examples include hydrochloric acid and sulfuric acid, which fully dissociate in water.

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