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Chemistry MCQs

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Easy fpsc Uploaded: 06 Aug 2026

What is the formula for table salt?

A NaCl
B KCl
C CaCl2
D MgCl2

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Correct Answer: Option A — NaCl

Explanation: Table salt is chemically known as sodium chloride, with the formula NaCl. It forms through an ionic bond between a sodium cation and a chloride anion, and is essential for various biological and industrial processes.

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Easy nts Uploaded: 07 Aug 2026

What is the common name for sodium hydroxide?

A Lime
B Baking soda
C Caustic soda
D Washing soda

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Correct Answer: Option C — Caustic soda

Explanation: Sodium hydroxide is commonly known as caustic soda, a strong base widely used in soap making, paper production, and industrial cleaning. It is highly corrosive and must be handled with appropriate safety precautions.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for water?

A H2
B HO2
C H3O
D H2O

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Correct Answer: Option D — H2O

Explanation: Water has the chemical formula H2O consisting of two hydrogen atoms bonded to one oxygen atom through covalent bonds forming a polar molecule.

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Easy ppsc Uploaded: 07 Aug 2026

What type of reaction occurs between an acid and a base?

A Combustion reaction
B Decomposition reaction
C Redox reaction
D Neutralization reaction

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Correct Answer: Option D — Neutralization reaction

Explanation: A neutralization reaction occurs when an acid reacts with a base to produce salt and water. This reaction typically results in a solution with a pH closer to neutral, depending on the strength of reactants.

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Easy nts Uploaded: 07 Aug 2026

Which type of chemical bond involves the transfer of electrons?

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

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Correct Answer: Option B — Ionic bond

Explanation: An ionic bond forms through the complete transfer of one or more electrons from a metal atom to a nonmetal atom, creating oppositely charged ions that attract each other through strong electrostatic forces.

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Easy fpsc Uploaded: 07 Aug 2026

Which of the following elements belongs to Group 17 of the periodic table?

A Sulfur
B Phosphorus
C Oxygen
D Chlorine

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Correct Answer: Option D — Chlorine

Explanation: Chlorine belongs to Group 17, known as the halogens, characterized by having seven valence electrons. These elements are highly reactive nonmetals that readily gain one electron to form stable negative ions.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of reaction involves an acid reacting with a base to form salt and water?

A Decomposition
B Redox
C Neutralisation
D Precipitation

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Correct Answer: Option C — Neutralisation

Explanation: Neutralisation is the reaction between an acid and a base producing salt and water for example hydrochloric acid reacting with sodium hydroxide to form sodium chloride and water.

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Easy nts Uploaded: 07 Aug 2026

Which acid is present in vinegar?

A Citric acid
B Acetic acid
C Lactic acid
D Formic acid

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Correct Answer: Option B — Acetic acid

Explanation: Vinegar contains acetic acid, typically at a concentration of 4-8%. This weak organic acid gives vinegar its characteristic sour taste and pungent smell, and is produced through fermentation of ethanol by bacteria.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the pH of pure water at 25 degrees Celsius?

A 5
B 9
C 7
D 14

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Correct Answer: Option C — 7

Explanation: Pure water has a pH of exactly 7 at 25 degrees Celsius making it neutral as it contains equal concentrations of hydrogen and hydroxide ions.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which gas turns limewater milky when bubbled through it?

A Oxygen
B Carbon dioxide
C Hydrogen
D Sulfur dioxide

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Correct Answer: Option B — Carbon dioxide

Explanation: Carbon dioxide turns limewater milky when bubbled through it as it reacts with calcium hydroxide to produce insoluble calcium carbonate as a white precipitate.

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Easy pms Uploaded: 06 Aug 2026

Which element is the lightest gas known?

A Helium
B Hydrogen
C Nitrogen
D Oxygen

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Correct Answer: Option B — Hydrogen

Explanation: Hydrogen is the lightest and most abundant element in the universe, consisting of just one proton and one electron. Due to its low density, hydrogen gas rises quickly in air and is used in various industrial applications.

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Easy nts Uploaded: 07 Aug 2026

What is the term for a mixture of two or more metals?

A Compound
B Alloy
C Solution
D Colloid

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Correct Answer: Option B — Alloy

Explanation: An alloy is a mixture of two or more metals, or a metal combined with a nonmetal, designed to enhance properties such as strength, corrosion resistance, or durability. Bronze and steel are common examples of alloys.

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Easy ppsc Uploaded: 07 Aug 2026

Which term describes elements in the same column of the periodic table?

A Series
B Blocks
C Periods
D Groups

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Correct Answer: Option D — Groups

Explanation: Elements arranged in the same vertical column of the periodic table are called groups. Elements within a group share similar chemical properties because they have the same number of valence electrons in their outer shell.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ammonia?

A NO2
B N2H4
C NH3
D NH4

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Correct Answer: Option C — NH3

Explanation: Ammonia has the chemical formula NH3 consisting of one nitrogen atom bonded to three hydrogen atoms and is widely used in fertiliser production and as a cleaning agent.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for hydrogen peroxide commonly used as an antiseptic?

A H2O2
B H2O
C H3O2
D HO2

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Correct Answer: Option A — H2O2

Explanation: Hydrogen peroxide H2O2 is a pale blue liquid used as an antiseptic bleaching agent and rocket propellant differing from water by having an extra oxygen atom.

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Easy nts Uploaded: 06 Aug 2026

Which subatomic particle has no electric charge?

A Neutron
B Electron
C Proton
D Ion

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Correct Answer: Option A — Neutron

Explanation: Neutrons are electrically neutral particles found in the nucleus of an atom alongside protons. They contribute to the atomic mass but do not affect the overall charge of the atom, unlike protons and electrons.

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Easy nts Uploaded: 07 Aug 2026

What is the chemical formula for baking soda?

A Na2CO3
B NaHCO3
C NaOH
D NaCl

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Correct Answer: Option B — NaHCO3

Explanation: Baking soda has the chemical formula NaHCO3, known as sodium bicarbonate. It is used widely in cooking as a leavening agent, as well as in cleaning products and as a mild antacid for stomach upset relief.

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Easy ppsc nts Uploaded: 14 Jul 2026

Which gas has the chemical formula CO2?

A Carbon dioxide
B Carbon monoxide
C Sulfur dioxide
D Nitrogen dioxide

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Correct Answer: Option A — Carbon dioxide

Explanation: Carbon dioxide with the formula CO2 consists of one carbon atom double bonded to two oxygen atoms and is a major greenhouse gas produced by combustion and respiration.

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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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Easy pms Uploaded: 06 Aug 2026

What is the chemical symbol for Sodium?

A So
B Na
C Sd
D Su

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Correct Answer: Option B — Na

Explanation: Sodium's chemical symbol Na comes from its Latin name 'natrium'. It is a highly reactive alkali metal in group 1 of the periodic table and is essential for nerve function in the human body.

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