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Chemistry JAMB Past Questions

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1101

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
1102

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
1103
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
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1104
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
1105

The process involved in the conversion of an oil into margarine is known as?

  • A. hydrogenation
  • B. condensation
  • C. pyrolysis
  • D. dehydration
  • E. cracking
View Answer & Discuss (4) JAMB 1985
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