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Chemistry Past Questions

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6

A compound gives an orange-red color to non-luminous flame. This compound is likely to contain?

  • A. Na+
  • B. Ca2+
  • C. Fe3+
  • D. Fe2+
View Answer & Discuss (6) JAMB 2010
7

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).
Compound X is?

  • A. an alkene
  • B. an alkane
  • C. an alkyne
  • D. tetrachloromethane
  • E. dichloromethane
View Answer & Discuss (2) JAMB 1985
8

When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?

  • A. turn moist red litmus paper blue
  • B. turn lime water milky
  • C. blacken lead acetate paper
  • D. rekindle a glowing splint
  • E. burn a sqeakly pop
View Answer & Discuss (6) JAMB 1980
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9

Which of the following tests would confirm-unequivocally that a solution X contain the sulphate ion if it gives with?

  • A. silver nitrates solution, a white precipates insoluble in dilute HNO3
  • B. barium chloride solution, a white precipitate insoluble in dilute H2SO4
  • C. barium chloride solution, a white precipitate soluble in dilute HCl
  • D. barium chloride solution a white precipitate soluble in dilute ammonia
  • E. barium chloride solution a white precipitate insoluble in dilute HCl
View Answer & Discuss (9) JAMB 1980
10

When copper (ii) sulphate solution is treated with excess ammonium hydroxide, a precipitate is first formed, and then this dissolves to give a deep blue solution.

This deep blue solution is a?

  • A. Cu(OH)2
  • B. CuSo4.5H2O
  • C. (NH4)2SO4
  • D. Cu(NH3)4(OH)2
  • E. CuSO4.(NH4)2SO4.2H2O
View Answer & Discuss (10) JAMB 1980
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