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CSS MCQs

Civil Superior Services — Complete MCQ Bank

106 Questions
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51
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
52
Chemistry Easy Uploaded: 07 Aug 2026

What is the name given to positively charged ions?

  • AAnions
  • BCations
  • CIsotopes
  • DIsomers
53
Chemistry Hard Uploaded: 07 Aug 2026

What is the term for the amount of energy required to remove an electron from an atom?

  • AElectron affinity
  • BIonization energy
  • CElectronegativity
  • DBond energy
54
Chemistry Medium Uploaded: 07 Aug 2026

Which gas is primarily responsible for the depletion of the ozone layer?

  • ACarbon dioxide
  • BChlorofluorocarbons
  • CMethane
  • DNitrogen
55
Chemistry Hard Uploaded: 07 Aug 2026

Which element has the highest melting point among all elements?

  • AIron
  • BTungsten
  • CPlatinum
  • DOsmium
56
Chemistry Medium Uploaded: 06 Aug 2026

What is the term for a solution that resists changes in pH?

  • ASaturated solution
  • BBuffer solution
  • CColloid
  • DSuspension
57
Chemistry Medium Uploaded: 06 Aug 2026

Which of these is a strong base?

  • ASodium hydroxide
  • BAmmonia
  • CAcetic acid
  • DCarbonic acid
58
Chemistry Medium Uploaded: 06 Aug 2026

What is the chemical name for rust?

  • AIron nitrate
  • BIron sulfide
  • CIron carbonate
  • DIron oxide
59
Chemistry Medium Uploaded: 06 Aug 2026

Which of the following is an alkali metal?

  • APotassium
  • BCalcium
  • CMagnesium
  • DAluminum
60
Chemistry Medium Uploaded: 06 Aug 2026

What is the term for a substance that speeds up a reaction without being consumed?

  • AReactant
  • BSolvent
  • CProduct
  • DCatalyst