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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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181
Medium css Uploaded: 07 Aug 2026

What is the formula for calculating molarity?

  • A Moles/Volume in litres
  • B Mass/Volume
  • C Moles/Mass
  • D Volume/Moles
Permalink
Correct Answer: Option A — Moles/Volume in litres
Explanation: Molarity is calculated by dividing the number of moles of solute by the volume of solution in litres. It is a widely used concentration unit in chemistry expressed as mol/L or M.
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182
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
Permalink
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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183
Easy pms Uploaded: 06 Aug 2026

What is the chemical symbol for Sodium?

  • A So
  • B Na
  • C Sd
  • D Su
Permalink
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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184
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
Permalink
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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185
Hard pms Uploaded: 06 Aug 2026

Which of the following elements is a metalloid?

  • A Silicon
  • B Sodium
  • C Sulfur
  • D Silver
Permalink
Correct Answer: Option A — Silicon
Explanation: Silicon is classified as a metalloid because it exhibits properties intermediate between metals and nonmetals. It is widely used in the electronics industry as a semiconductor material for computer chips and solar panels.
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186
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
Permalink
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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187
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the term for the energy required to remove one electron from a gaseous atom?

  • A Electron affinity
  • B Electronegativity
  • C Lattice energy
  • D Ionisation energy
Permalink
Correct Answer: Option D — Ionisation energy
Explanation: Ionisation energy is the minimum energy required to remove one electron from a gaseous atom in its ground state with first ionisation energy increasing across a period and decreasing down a group.
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188
Medium nts Uploaded: 07 Aug 2026

Which halogen is a liquid at room temperature?

  • A Iodine
  • B Fluorine
  • C Chlorine
  • D Bromine
Permalink
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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189
Hard css fpsc ppsc Uploaded: 14 Jul 2026

Which element has the highest electronegativity on the Pauling scale?

  • A Oxygen
  • B Chlorine
  • C Nitrogen
  • D Fluorine
Permalink
Correct Answer: Option D — Fluorine
Explanation: Fluorine has the highest electronegativity of all elements at 3.98 on the Pauling scale due to its small atomic size and high effective nuclear charge on its outer electrons.
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190
Medium ppsc Uploaded: 06 Aug 2026

Which element is essential for photosynthesis and found in chlorophyll?

  • A Iron
  • B Magnesium
  • C Zinc
  • D Calcium
Permalink
Correct Answer: Option B — Magnesium
Explanation: Magnesium is a central component of the chlorophyll molecule, which plants use to capture light energy during photosynthesis. Without adequate magnesium, plants cannot efficiently convert sunlight into chemical energy.
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191
Hard css Uploaded: 07 Aug 2026

Which of the following best describes Avogadro's number?

  • A 6.022 x 10^20
  • B 6.022 x 10^23
  • C 6.022 x 10^26
  • D 6.022 x 10^29
Permalink
Correct Answer: Option B — 6.022 x 10^23
Explanation: Avogadro's number, 6.022 x 10^23, represents the number of particles present in one mole of any substance. This fundamental constant bridges the gap between atomic-scale quantities and measurable macroscopic amounts of matter.
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192
Hard css fpsc ppsc Uploaded: 14 Jul 2026

What is the chemical formula for potassium permanganate a strong oxidising agent?

  • A KMnO4
  • B K2MnO4
  • C K2SO4
  • D K2Cr2O7
Permalink
Correct Answer: Option A — KMnO4
Explanation: Potassium permanganate has the formula KMnO4 and is a strong oxidising agent used in water treatment as a disinfectant and in analytical chemistry as a titrating agent.
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193
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
Permalink
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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194
Easy fpsc ppsc nts Uploaded: 14 Jul 2026

What is the chemical formula for sulfuric acid?

  • A H2SO4
  • B HNO3
  • C HCl
  • D H3PO4
Permalink
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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195
Medium css fpsc ppsc Uploaded: 14 Jul 2026

Which type of formula shows all the bonds between atoms in a molecule?

  • A Empirical formula
  • B Structural formula
  • C Molecular formula
  • D Ionic formula
Permalink
Correct Answer: Option B — Structural formula
Explanation: A structural formula shows all the atoms in a molecule and the bonds between them either as a displayed formula showing each bond or as a condensed structural formula.
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196
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
Permalink
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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197
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
Permalink
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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198
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
Permalink
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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199
Easy nts Uploaded: 07 Aug 2026

Which of the following is a diatomic molecule?

  • A Helium
  • B Neon
  • C Oxygen
  • D Argon
Permalink
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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200
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which type of organic reaction adds atoms across a carbon to carbon double bond in alkenes?

  • A Substitution
  • B Addition
  • C Elimination
  • D Hydrolysis
Permalink
Correct Answer: Option B — Addition
Explanation: Addition reactions are characteristic of alkenes where atoms or groups add across the carbon-carbon double bond breaking it and forming two new single bonds with the carbon atoms.
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