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CSS MCQs

Civil Superior Services — Complete MCQ Bank

106 Questions
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61
Chemistry Medium Uploaded: 06 Aug 2026

Which of these elements is a halogen?

  • ANeon
  • BChlorine
  • CSodium
  • DCalcium
62
Chemistry Medium Uploaded: 06 Aug 2026

What is the pH range of a strong acid?

  • A11-14
  • B4-6
  • C7
  • D0-3
63
Chemistry Easy Uploaded: 06 Aug 2026

Which of these is an example of a physical change?

  • ABurning wood
  • BRusting iron
  • CBaking a cake
  • DMelting ice
64
Chemistry Hard Uploaded: 06 Aug 2026

What is Avogadro's number approximately equal to?

  • A9.8 x 10^23
  • B3.14 x 10^23
  • C6.022 x 10^23
  • D1.6 x 10^23
65
Chemistry Hard Uploaded: 05 Aug 2026

Which element has the highest electronegativity of all elements on the Pauling scale?

  • AFluorine
  • BOxygen
  • CChlorine
  • DNitrogen
66
Chemistry Medium Uploaded: 05 Aug 2026

Which chemical process converts vegetable oils into solid fats by adding hydrogen gas?

  • ASaponification
  • BHydrogenation
  • CEsterification
  • DFermentation
67
Chemistry Medium Uploaded: 05 Aug 2026

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

  • ASubstitution
  • BAddition
  • CElimination
  • DHydrolysis
68
Chemistry Medium Uploaded: 05 Aug 2026

Which process adds water to a compound to break chemical bonds in organic reactions?

  • ADehydration
  • BOxidation
  • CReduction
  • DHydrolysis
69
Chemistry Medium Uploaded: 05 Aug 2026

What is the chemical formula for ethanoic acid commonly found in vinegar?

  • ACH3COOH
  • BHCOOH
  • CCH3CH2COOH
  • DC3H7COOH
70
Chemistry Medium Uploaded: 05 Aug 2026

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

  • AVulcanisation
  • BSaponification
  • CHydrogenation
  • DPolymerisation