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CSS MCQs

Civil Superior Services — Complete MCQ Bank

1,970 Questions
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791
Chemistry Medium Uploaded: 07 Aug 2026

What is the formula for calculating molarity?

  • AMoles/Volume in litres
  • BMass/Volume
  • CMoles/Mass
  • DVolume/Moles
792
Chemistry Medium Uploaded: 07 Aug 2026

What is the term for the minimum energy needed to start a chemical reaction?

  • AIonization energy
  • BLattice energy
  • CBond energy
  • DActivation energy
793
Chemistry Hard Uploaded: 07 Aug 2026

What is the empirical formula of benzene?

  • AC2H2
  • BC3H3
  • CC6H6
  • DCH
794
Chemistry Medium Uploaded: 07 Aug 2026

What type of reaction is photosynthesis classified as?

  • ACombustion
  • BExothermic
  • CEndothermic
  • DRedox only
795
Chemistry Medium Uploaded: 07 Aug 2026

What is the strongest type of intermolecular force?

  • AVan der Waals forces
  • BDipole-dipole forces
  • CHydrogen bonding
  • DLondon dispersion forces
796
Chemistry Medium Uploaded: 07 Aug 2026

Which element has the highest electronegativity?

  • AOxygen
  • BChlorine
  • CFluorine
  • DNitrogen
797
Chemistry Hard Uploaded: 07 Aug 2026

Which of the following describes Le Chatelier's Principle?

  • AReactions always favor products
  • BSystems at equilibrium resist changes to conditions
  • CCatalysts change equilibrium position
  • DReactions cannot reach equilibrium
798
Chemistry Hard Uploaded: 07 Aug 2026

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

  • AElectrochemistry
  • BThermochemistry
  • CPhotochemistry
  • DStoichiometry
799
Chemistry Medium Uploaded: 07 Aug 2026

What is the process of adding electrons in a redox reaction called?

  • AOxidation
  • BReduction
  • CIonization
  • DNeutralization
800
Chemistry Hard Uploaded: 07 Aug 2026

Which of the following best describes Avogadro's number?

  • A6.022 x 10^20
  • B6.022 x 10^23
  • C6.022 x 10^26
  • D6.022 x 10^29