Chemistry 2021 Past Questions | JAMB

Study the following Chemistry past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. A chemical process in which there is a gain of electrons is known as?

  • A. Sublimation
  • B. Reduction
  • C. Oxidation
  • D. Distillation

32. ——- are the reactions involving simultaneous oxidation and reduction

  • A. Automatic reactions
  • B. Alternate reactions
  • C. Reduction agency
  • D. Redox reactions

33. A binary compound of oxygen with another element is referred to as?

  • A. Oxide
  • B. Element
  • C. Carbon
  • D. Nitrogen

34. The process or act of extracting a metal from its ore and refining it is called?

  • A. Extraction
  • B. Metal mining
  • C. Metallurgy
  • D. Prospecting

35. The compounds made up of only carbon and hydrogen are called?

  • A. Carbon compounds
  • B. Hydro carbons
  • C. Atoms
  • D. Carbon hydrolysis

36. One of the following is not a physical property of monosaccharides 

  • A. Monosaccharides get charred when heated
  • B. Monosaccharides are water-soluble, sweet substances
  • C. They are highly vital to the exploration of metals
  • D. They can be reduced to sugar alcohols

37. In troposphere, the two types of pollutants are?

  • A. Gaseous and particulate pollutants
  • B. Carbon and metallic pollutants
  • C. Natural and man-made pollutants
  • D. Sulphuric and nitrogenous pollutants

38. The molar enthalpy change accompanying the removal of an electron from a gas phase atom or ion in its ground state is called

  • A. Electron gain enthalpy
  • B. Ionization enthalpy
  • C. Enthalpy change
  • D. Enthalpic gas removal

39. The fourteen elements (atomic number 90-103) after actinum are called? 

  • A. Actinoids
  • B. Nucleotides
  • C. Pre-actinum elements
  • D. Atomic elements

40. The process by which salt and water reacted in a limited way to form an acid and base is?

  • A. Neutral process
  • B. Basic acidic process
  • C. Hydrolysis
  • D. Sublimation

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