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Chemistry MCQs

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Easy nts Uploaded: 07 Aug 2026

What is the boiling point of water at standard atmospheric pressure?

A 90°C
B 95°C
C 100°C
D 110°C

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Correct Answer: Option C — 100°C

Explanation: Water boils at 100°C under standard atmospheric pressure of 1 atmosphere at sea level. This boiling point decreases at higher altitudes due to reduced atmospheric pressure, affecting cooking times in mountainous regions.

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Easy nts Uploaded: 07 Aug 2026

Which of the following is an example of a physical property?

A Flammability
B Reactivity with acid
C Boiling point
D Toxicity

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Correct Answer: Option C — Boiling point

Explanation: Boiling point is a physical property because it can be observed and measured without changing the chemical composition of a substance. Physical properties describe characteristics like color, density, and melting point.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfuric acid?

A H2SO4
B HNO3
C HCl
D H3PO4

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Correct Answer: Option A — H2SO4

Explanation: Sulfuric acid has the chemical formula H2SO4 and is one of the most important industrial chemicals used in fertiliser production batteries and various chemical processes.

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Easy nts Uploaded: 07 Aug 2026

What is the process called when a liquid changes to vapor below its boiling point?

A Evaporation
B Sublimation
C Condensation
D Boiling

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Correct Answer: Option A — Evaporation

Explanation: Evaporation is the process where liquid molecules at the surface gain enough energy to escape into the gas phase below the boiling point. It occurs at any temperature and increases with higher surface area and temperature.

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Easy ppsc nts Uploaded: 14 Jul 2026

Which noble gas is used in glowing advertising signs giving a reddish-orange colour?

A Argon
B Helium
C Neon
D Krypton

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Correct Answer: Option C — Neon

Explanation: Neon gas is used in neon signs and emits a characteristic reddish-orange glow when electricity passes through it due to the excitation of its electrons.

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Easy nts Uploaded: 07 Aug 2026

Which of the following is a diatomic molecule?

A Helium
B Neon
C Oxygen
D Argon

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Correct Answer: Option C — Oxygen

Explanation: Oxygen exists naturally as a diatomic molecule, O2, where two oxygen atoms are covalently bonded together. This form is essential for respiration in most living organisms and combustion reactions on Earth.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which scientist is known as the Father of Modern Chemistry?

A Isaac Newton
B Robert Boyle
C John Dalton
D Antoine Lavoisier

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Correct Answer: Option D — Antoine Lavoisier

Explanation: Antoine Lavoisier is known as the Father of Modern Chemistry for establishing the law of conservation of mass and developing a systematic chemical nomenclature.

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Easy nts Uploaded: 07 Aug 2026

What is the common name for the compound CaCO3?

A Quicklime
B Slaked lime
C Gypsum
D Limestone

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Correct Answer: Option D — Limestone

Explanation: Calcium carbonate, commonly known as limestone, is a naturally occurring compound used extensively in construction, cement production, and as a source material for producing quicklime through thermal decomposition.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for silver?

A Si
B Ag
C Sr
D Sn

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Correct Answer: Option B — Ag

Explanation: The chemical symbol for silver is Ag derived from the Latin word Argentum and silver is a precious metal with the highest electrical and thermal conductivity of all metals.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the SI unit of the amount of substance in chemistry?

A Gram
B Litre
C Kilogram
D Mole

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Correct Answer: Option D — Mole

Explanation: The Mole is the SI unit for the amount of substance and one mole of any substance contains approximately 6.022 x 10 to the power 23 particles.

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Easy fpsc Uploaded: 07 Aug 2026

What is the chemical formula of ozone?

A O4
B O
C O2
D O3

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Correct Answer: Option D — O3

Explanation: Ozone has the chemical formula O3, consisting of three oxygen atoms bonded together. It forms a protective layer in the stratosphere that absorbs harmful ultraviolet radiation from the sun, shielding life on Earth.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the name of the process by which a liquid changes to a gas at its boiling point?

A Vaporisation
B Sublimation
C Condensation
D Freezing

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Correct Answer: Option A — Vaporisation

Explanation: Vaporisation is the process by which a liquid changes to a gas at its boiling point when sufficient thermal energy overcomes the intermolecular forces holding liquid molecules together.

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Easy fpsc Uploaded: 07 Aug 2026

Which of the following is a property of metals?

A Low melting points
B Poor conductors of heat
C Brittle
D Malleable and ductile

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Correct Answer: Option D — Malleable and ductile

Explanation: Metals are generally malleable and ductile, meaning they can be hammered into sheets or drawn into wires without breaking. This property arises from the delocalized electron sea structure that allows metal atoms to slide past each other.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for methane, the main component of natural gas?

A C2H6
B CH4
C C3H8
D C2H4

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Correct Answer: Option B — CH4

Explanation: Methane has the chemical formula CH4 consisting of one carbon atom bonded to four hydrogen atoms and is the simplest alkane and the primary component of natural gas.

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Easy css Uploaded: 07 Aug 2026

What is the name given to positively charged ions?

A Anions
B Cations
C Isotopes
D Isomers

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Correct Answer: Option B — Cations

Explanation: Cations are positively charged ions formed when an atom loses one or more electrons. They are attracted to the cathode, or negative electrode, during electrolysis and commonly include metal ions such as sodium and calcium.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which element is the most abundant in the universe?

A Hydrogen
B Helium
C Carbon
D Oxygen

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Correct Answer: Option A — Hydrogen

Explanation: Hydrogen is the most abundant element in the universe making up approximately 75 percent of all normal matter by mass and is the primary fuel for nuclear fusion in stars.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which process converts sugar into alcohol and carbon dioxide using yeast?

A Distillation
B Hydrogenation
C Saponification
D Fermentation

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Correct Answer: Option D — Fermentation

Explanation: Fermentation is the anaerobic process by which yeast converts sugars into ethanol and carbon dioxide producing alcoholic beverages and is also used in bread making.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical name for baking soda commonly used in cooking?

A Sodium hydroxide
B Sodium carbonate
C Sodium chloride
D Sodium bicarbonate

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Correct Answer: Option D — Sodium bicarbonate

Explanation: Baking soda is sodium bicarbonate NaHCO3 which releases carbon dioxide gas when heated or mixed with acid causing baked goods to rise during cooking.

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