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CSS MCQs

Civil Superior Services — Complete MCQ Bank

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41
Chemistry Easy Uploaded: 04 Sep 2026

Which gas is released when metals react with dilute acids?

  • AHydrogen
  • BOxygen
  • CNitrogen
  • DCarbon dioxide
42
Chemistry Medium Uploaded: 04 Sep 2026

What is the term for a substance that speeds up rusting of iron?

  • APaint
  • BOil
  • CElectrolyte (like salt water)
  • DDry air
43
Chemistry Hard Uploaded: 04 Sep 2026

What is the equivalence point in a titration?

  • APoint where indicator changes color permanently
  • BPoint where moles of acid equal moles of base
  • CPoint of maximum temperature
  • DStarting point of titration
44
Chemistry Easy Uploaded: 04 Sep 2026

What is the term for a positively charged ion?

  • ACation
  • BIsotope
  • CAnion
  • DIsomer
45
Chemistry Hard Uploaded: 04 Sep 2026

What is the term for two or more different atomic nuclei with the same mass number but different atomic numbers?

  • AIsotones
  • BIsomers
  • CIsotopes
  • DIsobars
46
Chemistry Medium Uploaded: 04 Sep 2026

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

  • AElectronegativity
  • BIonization energy
  • CLattice energy
  • DElectron affinity
47
Chemistry Hard Uploaded: 04 Sep 2026

Which type of mixture has particles that scatter light, known as the Tyndall effect?

  • AColloid
  • BTrue solution
  • CPure compound
  • DSuspension only
48
Chemistry Medium Uploaded: 04 Sep 2026

What happens to the solubility of most solid solutes as temperature increases?

  • ADecreases
  • BRemains constant
  • CIncreases
  • DBecomes zero
49
Chemistry Medium Uploaded: 04 Sep 2026

What is the trend in ionization energy down a group?

  • ARemains constant
  • BFluctuates randomly
  • CIncreases
  • DDecreases
50
Chemistry Easy Uploaded: 04 Sep 2026

Enzymes are biological catalysts primarily made of:

  • ALipids
  • BNucleic acids
  • CCarbohydrates
  • DProteins