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Chemistry JAMB Past Questions

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1131

A white solid suspected to be lead trioxonitrate (V) zinc trioxocarbonate (IV) or calcium trioxocabonate (IV) was heated strongly. Its residue which was yellow when hot and white when cold is?

  • A. lead (II) oxide
  • B. calcium oxide
  • C. zinc oxide
  • D. lead nitrate
View Answer & Discuss (10) JAMB 1986
1132
Which of the following compounds would give lilac flame coloration and a white precipitate with acidified barium chloride solution?
  • A. KCI
  • B. NaNO3
  • C. K2SO4
  • D. CaSO4
View Answer & Discuss (5) JAMB 1986
1133
How will a metal X, which reacts explosively with air and with dilute acids be best extracted from its ores?
  • A. Electrolysis of solution of its salts
  • B. Decomposition of its oxides
  • C. Displacement from solution by an alkali metal
  • D. Electroiysis of fused salt
View Answer & Discuss (6) JAMB 1986
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1134
Which of the following is NOT correct test for the named organic compound in each case?
  • A. Butanoic acid solution gives effervescence with Na2CO3 solution
  • B. Glucose when reacted with Na2CrO4 at 0°C will show immediate discharge of colour
  • C. When but-2-ene is reacted with dilute solution of KMnO4 the purple colour of KMnO is discharged readily even room temperature
  • D. When butan-2-ol is boiled with butanoic acid with a drop of concentrated H2SO4 a sweet smelling liquid is produced
View Answer & Discuss (4) JAMB 1986
1135

Which of the following is used as an 'anti-knock' in automobile engines?

  • A. Tetramethyl silane
  • B. Lead tetra-ethyl
  • C. Glycerol
  • D. n-heptane
View Answer & Discuss (3) JAMB 1986
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