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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
3741

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
3742

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
3743

Which of the following conditions will most enhance the spontaneity of a reaction?

  • A. \(\Delta\)H is negative and greater than T\(\Delta\)S
  • B. \(\Delta\)H is negative and \(\Delta\)S = 0
  • C. \(\Delta\)H is positive and less than T\(\Delta\)S
  • D. \(\Delta\)H is positive and equal to T\(\Delta\)S
View Answer & Discuss (10) JAMB 2019
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3744

X is a substance which liberates CO\(_2\) on treatment with concentrated H\(_2\)SO\(_4\). A warm solution of X can decolorize acidified KMnO\(_4\). X is

  • A. HCOOH
  • B. NaHCO\(_3\)
  • C. FeCO\(_3\)
  • D. H\(_2\)C\(_2\)O\(_4\)
View Answer & Discuss JAMB 2019
3745

The velocity, V of a gas is related to its mass, M by (k = proportionality constant)

  • A. V = \(\frac{k}{M}\)
  • B. V = \(\frac{k}{M^{\frac{1}{2}}}\)
  • C. V = \(kM^2\)
  • D. V = \((\frac{k}{M})^{\frac{1}{2}}\)
View Answer & Discuss (3) JAMB 2019
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