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Chemistry 2001 NECO Past Questions

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36
Detergents are better than soaps for washing in hard water because
  • A. hard water contains insoluble calcium salts.
  • B. they contain bleaching powder.
  • C. they contain palmitic acid.
  • D. they do not form insoluble calcium and magnesium salts.
  • E. they are organic compounds.
View Answer & Discuss (2) NECO 2001
37
Fructose and glucose are
  • A. allotropes of each other.
  • B. both disaccharides
  • C. dimere of each other.
  • D. isomers of each other
  • E. isotopes of each other
View Answer & Discuss (1) NECO 2001
38
A measure of the degree of disorderliness in a chemical system is known as the
  • A. activation energy
  • B. enthalpy
  • C. entropy
  • D. equilibrium
  • E. free energy.
View Answer & Discuss NECO 2001
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39
When an electric current is passed through a solution containing dilute tetraoxosulphate (Vi) acid, 190 cm3 of hydrogen gas is evolved. if the measurements were made at 26°C and 736 mmHg, what is the volume of hydrogen at s.t.p.?
  • A. 164 cm3
  • B. 168 cm3
  • C. 179.1.cm3
  • D. 201.5cm3
  • E. 546 cm3
View Answer & Discuss (5) NECO 2001
40

if an element X with atomic number 13 combines with an element Y whose atomic number is 8 the most likely formula of the compound formed between X and Y is?

  • A. XY
  • B. X2Y
  • C. XY2
  • D. X3Y2
  • E. X2Y3
View Answer & Discuss (7) NECO 2001
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