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Chemistry MCQs

235 Questions Subject Test
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Practice the essential concepts of matter, atomic structure, chemical reactions, bonding and everyday applications of chemistry.

Atomic StructureChemical BondingReactionsOrganic Chemistry
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201
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
Permalink
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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202
Hard css Uploaded: 07 Aug 2026

Which scientist proposed the modern periodic law?

  • A Antoine Lavoisier
  • B John Dalton
  • C Dmitri Mendeleev
  • D Henry Moseley
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Correct Answer: Option D — Henry Moseley
Explanation: Henry Moseley formulated the modern periodic law based on atomic number rather than atomic mass, which Mendeleev had originally used. Moseley's X-ray spectroscopy work corrected several anomalies in Mendeleev's original table.
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203
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
Permalink
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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204
Medium pms Uploaded: 06 Aug 2026

Which of the following is a noble gas?

  • A Chlorine
  • B Neon
  • C Sulfur
  • D Phosphorus
Permalink
Correct Answer: Option B — Neon
Explanation: Neon is a noble gas found in group 18 of the periodic table. Noble gases have a full outer electron shell, making them extremely stable and largely unreactive under normal conditions, unlike chlorine, sulfur, or phosphorus.
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205
Hard css Uploaded: 07 Aug 2026

Which element has the highest melting point among all elements?

  • A Iron
  • B Tungsten
  • C Platinum
  • D Osmium
Permalink
Correct Answer: Option B — Tungsten
Explanation: Tungsten has the highest melting point of any element at approximately 3422°C, making it valuable for applications requiring extreme heat resistance such as light bulb filaments and welding electrodes.
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206
Medium css fpsc ppsc Uploaded: 14 Jul 2026

What does Avogadro's number represent?

  • A Number of atoms in 1 gram of hydrogen
  • B Number of particles in one mole of a substance
  • C Number of molecules in 1 litre of gas
  • D Number of protons in a nucleus
Permalink
Correct Answer: Option B — Number of particles in one mole of a substance
Explanation: Avogadro's number is approximately 6.022 x 10 to the power 23 and represents the number of atoms molecules or ions contained in one mole of any substance.
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207
Medium pms Uploaded: 06 Aug 2026

What is the chemical symbol for Potassium?

  • A Po
  • B Pt
  • C K
  • D P
Permalink
Correct Answer: Option C — K
Explanation: Potassium's chemical symbol K comes from its Latin name 'kalium'. It is a soft, silvery alkali metal essential for nerve function and muscle contraction in living organisms, and is highly reactive with water.
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208
Medium pms Uploaded: 07 Aug 2026

Which process involves the splitting of a heavy nucleus into smaller nuclei?

  • A Beta decay
  • B Nuclear fusion
  • C Nuclear fission
  • D Radioactive decay
Permalink
Correct Answer: Option C — Nuclear fission
Explanation: Nuclear fission is the process where a heavy atomic nucleus splits into two or more smaller nuclei, releasing significant amounts of energy. This reaction powers nuclear reactors and was used in early atomic weapons.
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209
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
Permalink
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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210
Hard css fpsc Uploaded: 14 Jul 2026

What is the chemical formula for chloroform a once common anaesthetic?

  • A CH2Cl2
  • B CCl4
  • C CHCl2
  • D CHCl3
Permalink
Correct Answer: Option D — CHCl3
Explanation: Chloroform has the chemical formula CHCl3 and was historically used as an anaesthetic and is now used as a solvent in chemical synthesis and laboratory work.
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211
Easy nts Uploaded: 07 Aug 2026

What is the common name for the compound CaCO3?

  • A Quicklime
  • B Slaked lime
  • C Gypsum
  • D Limestone
Permalink
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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212
Easy ppsc nts Uploaded: 14 Jul 2026

What is the chemical symbol for silver?

  • A Si
  • B Ag
  • C Sr
  • D Sn
Permalink
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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213
Medium css Uploaded: 06 Aug 2026

Which of these elements is a halogen?

  • A Neon
  • B Chlorine
  • C Sodium
  • D Calcium
Permalink
Correct Answer: Option B — Chlorine
Explanation: Chlorine belongs to the halogen group, group 17 of the periodic table. Halogens are highly reactive nonmetals that readily form salts with metals, and chlorine is widely used for water purification and disinfection.
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214
Medium pms Uploaded: 07 Aug 2026

Which gas is used in the manufacture of fertilizers?

  • A Oxygen
  • B Ammonia
  • C Chlorine
  • D Helium
Permalink
Correct Answer: Option B — Ammonia
Explanation: Ammonia is a key raw material in fertilizer manufacturing, providing the nitrogen that plants require for growth. It is synthesized industrially through the Haber process, combining atmospheric nitrogen with hydrogen gas.
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215
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which process hardens rubber by adding sulfur making it stronger and more elastic?

  • A Vulcanisation
  • B Saponification
  • C Hydrogenation
  • D Polymerisation
Permalink
Correct Answer: Option A — Vulcanisation
Explanation: Vulcanisation is the process of treating rubber with sulfur at high temperature creating cross-links between polymer chains making the rubber harder more durable and resistant to temperature changes.
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216
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
Permalink
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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217
Easy fpsc Uploaded: 07 Aug 2026

What is the chemical formula of ozone?

  • A O4
  • B O
  • C O2
  • D O3
Permalink
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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218
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
Permalink
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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219
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What are the products of the electrolysis of brine sodium chloride solution?

  • A Sodium and water
  • B Hydrogen chlorine and sodium hydroxide
  • C Chlorine and sodium
  • D Sodium chloride and water
Permalink
Correct Answer: Option B — Hydrogen chlorine and sodium hydroxide
Explanation: Electrolysis of brine produces hydrogen gas at the cathode chlorine gas at the anode and sodium hydroxide solution remaining in the electrolyte through the chlor-alkali process.
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220
Hard nts Uploaded: 06 Aug 2026

What is the term for elements with the same number of protons but different numbers of neutrons?

  • A Allotropes
  • B Isomers
  • C Isobars
  • D Isotopes
Permalink
Correct Answer: Option D — Isotopes
Explanation: Isotopes are variants of an element that share the same atomic number but differ in mass number due to varying neutron counts. Carbon-12 and Carbon-14 are common examples of isotopes used in dating and research.
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