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Chemistry MCQs

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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for nitric acid used in fertiliser and explosive manufacturing?

A H2SO4
B HCl
C H3PO4
D HNO3

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Correct Answer: Option D — HNO3

Explanation: Nitric acid has the formula HNO3 and is a strong oxidising acid used in the production of fertilisers explosives and in metal etching processes.

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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the name of the vertical columns in the periodic table?

A Periods
B Blocks
C Groups
D Rows

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Correct Answer: Option C — Groups

Explanation: Groups are the vertical columns in the periodic table and elements in the same group have the same number of valence electrons giving them similar chemical properties and reactivity.

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Medium nts Uploaded: 07 Aug 2026

What is the electronic configuration of Neon (2-8-2)?

A 2-2-8
B 2-8
C 2-8-8
D 2-6-2

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Correct Answer: Option C — 2-8-8

Explanation: Neon has an atomic number of 10 and an electronic configuration of 2-8, meaning two electrons occupy the first shell and eight electrons fill the second shell completely, giving it a stable noble gas structure.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas is produced when an acid reacts with a metal?

A Oxygen
B Hydrogen
C Nitrogen
D Carbon dioxide

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Correct Answer: Option B — Hydrogen

Explanation: When acids react with metals hydrogen gas is produced along with a salt for example zinc reacting with hydrochloric acid produces zinc chloride and hydrogen gas.

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Hard nts Uploaded: 06 Aug 2026

What is the oxidation state of oxygen in most compounds?

A -2
B -1
C +1
D +2

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Correct Answer: Option A — -2

Explanation: Oxygen typically has an oxidation state of -2 in most of its compounds, as it tends to gain two electrons to complete its outer shell. Exceptions include peroxides, where oxygen has an oxidation state of -1.

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Medium fpsc ppsc nts Uploaded: 05 Aug 2026

What gas is produced when calcium carbonate is heated strongly in thermal decomposition?

A Oxygen
B Sulfur dioxide
C Carbon dioxide
D Carbon monoxide

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Correct Answer: Option C — Carbon dioxide

Explanation: Heating calcium carbonate strongly causes thermal decomposition producing calcium oxide quicklime and carbon dioxide gas a reaction widely used in cement production and lime kilns.

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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of chemical reaction involves a substance combining with oxygen to release energy?

A Reduction
B Oxidation
C Neutralisation
D Decomposition

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Correct Answer: Option B — Oxidation

Explanation: Oxidation involves the combination of a substance with oxygen releasing energy often as heat and light as seen in combustion reactions such as burning wood or fuels.

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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of hydrocarbon contains at least one carbon to carbon double bond?

A Alkane
B Alkyne
C Alkene
D Arene

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Correct Answer: Option C — Alkene

Explanation: Alkenes are unsaturated hydrocarbons containing at least one carbon to carbon double bond making them more reactive than alkanes and important in polymer production.

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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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Medium nts Uploaded: 07 Aug 2026

Which halogen is a liquid at room temperature?

A Iodine
B Fluorine
C Chlorine
D Bromine

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Correct Answer: Option D — Bromine

Explanation: Bromine is the only halogen that exists as a liquid at room temperature, with a reddish-brown color and pungent odor. It is used in flame retardants, pharmaceuticals, and various industrial chemical processes.

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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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Medium nts Uploaded: 06 Aug 2026

Which type of chemical bond is found in metals?

A Ionic bond
B Covalent bond
C Metallic bond
D Hydrogen bond

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Correct Answer: Option C — Metallic bond

Explanation: Metallic bonding occurs when metal atoms share a 'sea' of delocalized electrons that move freely among positively charged metal ions. This structure explains why metals conduct electricity and heat efficiently and are malleable.

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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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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfur dioxide a gas that causes acid rain?

A SO3
B S2O
C SO
D SO2

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Correct Answer: Option D — SO2

Explanation: Sulfur dioxide SO2 is produced by burning fossil fuels containing sulfur and when it reacts with atmospheric moisture it forms sulfurous and sulfuric acid contributing to acid rain.

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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for glucose, the primary energy source for cells?

A C6H10O5
B C12H22O11
C C6H12O6
D C6H6O6

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Correct Answer: Option C — C6H12O6

Explanation: Glucose has the chemical formula C6H12O6 and is a monosaccharide sugar that serves as the primary energy source for cellular respiration in living organisms.

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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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