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Chemistry 2019 JAMB Past Questions

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61

The oxidation state(s) of nitrogen in ammonium nitrite is/are

  • A. -3, +3
  • B. +5
  • C. -3, +5
  • D. -3
View Answer & Discuss (5) JAMB 2019
62

Hydrogen bond is a sort of

  • A. van der waals force
  • B. dative bond
  • C. ionic bond
  • D. a covalent bond
View Answer & Discuss (4) JAMB 2019
63

Methane is prepared in the laboratory by heating a mixture of sodium ethanoate with soda lime. The chemical constituent(s) of soda lime is/are

  • A. Ca(OH)\(_2\) and NaOH
  • B. Na\(_2\)CO\(_3\)
  • C. NaCl
  • D. NaOH
View Answer & Discuss (1) JAMB 2019
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64

Which of the following sets of operation will completely separate a mixture of sodium chloride, sand and iodine?

  • A. addition of water, filtration, evaporation to dryness and sublimation
  • B. filtration, evaporation to dryness, addition of water and sublimation
  • C. sublimation, filtration, evaporation and addition of water
  • D. sublimation, addition of water, filtration and evaporation to dryness
View Answer & Discuss (11) JAMB 2019
65

200cm\(^3\) of 0.50mol/dm\(^3\) solution of calcium hydrogen trioxocarbonate (IV) is heated. The maximum weight of solid precipitated is

  • A. 10g
  • B. 25g
  • C. 20g
  • D. 15g
View Answer & Discuss JAMB 2019
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