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Chemistry MCQs

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Medium css Uploaded: 06 Aug 2026

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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Medium pms Uploaded: 07 Aug 2026

Which element is used in the production of stainless steel to prevent rusting?

A Zinc
B Chromium
C Copper
D Tin

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Correct Answer: Option B — Chromium

Explanation: Chromium is added to steel to produce stainless steel, forming a thin protective oxide layer on the surface that prevents corrosion and rusting. This alloy is widely used in kitchenware, medical instruments, and construction.

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Hard css fpsc Uploaded: 14 Jul 2026

Which element in Group 1 of the periodic table reacts most vigorously with water?

A Lithium
B Sodium
C Caesium
D Potassium

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Correct Answer: Option C — Caesium

Explanation: Caesium the heaviest stable Group 1 alkali metal reacts most vigorously with water due to its large atomic radius and low ionisation energy resulting in an explosive reaction.

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Medium ppsc Uploaded: 07 Aug 2026

Which of the following describes a saturated solution?

A Contains excess undissolved solute
B Contains only solvent
C Contains no solute
D Contains maximum solute at given temperature

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Correct Answer: Option D — Contains maximum solute at given temperature

Explanation: A saturated solution contains the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature. Adding more solute beyond this point results in undissolved excess settling at the bottom.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical name of NaOH?

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

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Correct Answer: Option D — Sodium hydroxide

Explanation: NaOH is sodium hydroxide also known as caustic soda a strong base used in soap making paper production and as a drain cleaner due to its highly alkaline properties.

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Easy nts Uploaded: 06 Aug 2026

What type of reaction occurs when an acid reacts with a base?

A Neutralization
B Oxidation
C Combustion
D Decomposition

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Correct Answer: Option A — Neutralization

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 the reactants.

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Easy ppsc Uploaded: 07 Aug 2026

What is the common name for the compound NaCl?

A Baking soda
B Table salt
C Washing soda
D Epsom salt

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Correct Answer: Option B — Table salt

Explanation: Sodium chloride, commonly known as table salt, is an ionic compound essential for human health and widely used as a food seasoning and preservative. It is obtained through mining or evaporation of seawater.

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Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which synthetic polymer was the first to be produced commercially and is used to make electrical fittings?

A Nylon
B PVC
C Bakelite
D Polythene

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Correct Answer: Option C — Bakelite

Explanation: Bakelite was the first commercially produced synthetic polymer made from phenol and formaldehyde in 1907 and is used in electrical fittings phone casings and kitchenware.

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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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Medium fpsc ppsc nts Uploaded: 14 Jul 2026

Which type of bond involves the complete transfer of electrons from one atom to another?

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

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Correct Answer: Option B — Ionic bond

Explanation: An ionic bond involves the complete transfer of one or more electrons from a metal atom to a non-metal atom creating oppositely charged ions that attract each other electrostatically.

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Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for lead?

A Pb
B Ld
C Le
D Li

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Correct Answer: Option A — Pb

Explanation: The chemical symbol for lead is Pb derived from the Latin word Plumbum and lead is a dense heavy metal with atomic number 82 used in batteries and radiation shielding.

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Easy nts Uploaded: 07 Aug 2026

Which of these is a noble gas?

A Argon
B Bromine
C Sulfur
D Chlorine

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Correct Answer: Option A — Argon

Explanation: Argon belongs to Group 18 of the periodic table known as noble gases. These elements have complete outer electron shells, making them chemically inert and unreactive under normal conditions.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for ozone, the molecule that forms the protective layer in the stratosphere?

A O
B O2
C O3
D O4

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Correct Answer: Option C — O3

Explanation: Ozone has the chemical formula O3 consisting of three oxygen atoms and forms the stratospheric ozone layer that absorbs harmful UV radiation protecting life on Earth.

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Easy fpsc Uploaded: 06 Aug 2026

What is the common name for sodium bicarbonate?

A Caustic soda
B Washing soda
C Baking soda
D Bleaching powder

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Correct Answer: Option C — Baking soda

Explanation: Sodium bicarbonate is commonly known as baking soda, used widely in cooking as a leavening agent. It reacts with acids to release carbon dioxide gas, which causes dough to rise during baking.

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What is the term used for the study of heat changes in chemical reactions?

A Electrochemistry
B Thermochemistry
C Photochemistry
D Stoichiometry

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Correct Answer: Option B — Thermochemistry

Explanation: Thermochemistry is the branch of chemistry that studies the heat energy associated with chemical reactions and physical transformations. It helps determine whether reactions are exothermic or endothermic based on enthalpy changes.

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Easy fpsc ppsc nts Uploaded: 05 Aug 2026

What is the IUPAC name for CH3-CH2-OH the simplest alcohol found in beverages?

A Methanol
B Propanol
C Butanol
D Ethanol

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Correct Answer: Option D — Ethanol

Explanation: Ethanol also written as C2H5OH is the simplest alcohol produced by fermentation of sugars and is found in alcoholic beverages used as a solvent and as a biofuel.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which test is used to detect the presence of starch using iodine solution?

A Benedict's test
B Biuret test
C Iodine test
D Flame test

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Correct Answer: Option C — Iodine test

Explanation: The iodine test detects starch by turning iodine solution from yellow-brown to blue-black in the presence of starch due to the triiodide ion fitting within the starch helix.

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Easy nts Uploaded: 07 Aug 2026

What is the chemical name for vinegar's active ingredient?

A Formic acid
B Citric acid
C Ethanol
D Acetic acid

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Correct Answer: Option D — Acetic acid

Explanation: The active ingredient in vinegar is acetic acid, a weak organic acid produced through the fermentation of ethanol by acetic acid bacteria. It gives vinegar its distinctive sour taste and preservative properties.

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Easy fpsc ppsc nts Uploaded: 14 Jul 2026

Which element is a liquid at room temperature and is used in thermometers?

A Bromine
B Gallium
C Mercury
D Caesium

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Correct Answer: Option C — Mercury

Explanation: Mercury is a metal that remains liquid at room temperature with a melting point of minus 38.8 degrees Celsius and has been traditionally used in thermometers and barometers.

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Hard css Uploaded: 06 Aug 2026

What is Avogadro's number approximately equal to?

A 9.8 x 10^23
B 3.14 x 10^23
C 6.022 x 10^23
D 1.6 x 10^23

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Correct Answer: Option C — 6.022 x 10^23

Explanation: Avogadro's number, approximately 6.022 x 10^23, represents the number of particles in one mole of a substance. It is a fundamental constant used to convert between the atomic scale and macroscopic quantities in chemistry.

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