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Chemistry Past Questions

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1101

A colourless organic compound X was burnt in excess air to give two colourless and odourless gases, Y and Z, as products. X does not decolorize blue bromine vapour, Y turns lime milky while Z gives a blue colour with copper (ll) tetraoxosulphate (IV).
Y and Z are respectively?

  • A. CO2 and NH3
  • B. CO and NH3
  • C. SO2 and H2O
  • D. CO2 and H2O
  • E. SO2 and NH3
View Answer & Discuss (4) JAMB 1985
1102

Which of the following compounds is NOT the correct product formed when the parent metals is heated in air?

  • A. Calcium oxide (CaO)
  • B. Sodium oxide (Na2O)
  • C. Copper (ll) oxide (CuO)
  • D. Tri-iron tetroxide (Fe3O4)
  • E. Aluminium oxide (Al2O3)
View Answer & Discuss (15) JAMB 1985
1103

The atomic number of an element whose cation, X2+, has the ground state electronic configuration 1s22s22p63s22p6 is?

  • A. 16
  • B. 18
  • C. 20
  • D. 22
  • E. 24
View Answer & Discuss (22) JAMB 1985
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1104
When marble is heated to about 1473 K, another white solid is obtained which reacts vigorously with water to give an alkaline solution. The solution contains?
  • A. NaOH
  • B. KOH
  • C. Mg(OH)2
  • D. Zn(OH)2
  • E. Ca(OH)2
View Answer & Discuss (5) JAMB 1985
1105
Addition of dilute hydrochloride acid to an aqueous solution of a crystalline salt yield a yellow precipitate and a gas which turned dichromate paper green. The crystalline salt was probably?
  • A. Na2SO4
  • B. Na2S
  • C. Na2S2O3.5H2O
  • D. Na2CO3
  • E. NaHCO3
View Answer & Discuss (13) JAMB 1985
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