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Chemistry Past Questions

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3011
The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.
  • A. chlorine
  • B. aluminium
  • C. silicon
  • D. magnesium
  • E. sodium
View Answer & Discuss (11) JAMB 1980
3012

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
3013

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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3014

Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?

  • A. N2O
  • B. NO
  • C. NO2
  • D. NaNO3
  • E. NH3
View Answer & Discuss (8) JAMB 1980
3015
Detergents are more advantageous than soaps in hard water districts because
  • A. on treatment with hard water they either form soluble calcium salts or do not react with calcium ion
  • B. on treatment with hard water they form soluble calcium salts
  • C. on treatment with hard water they form sodium salts
  • D. on treatment with hard water they are converted into soaps
  • E. on treatment with hard water they form more lather than soaps does
View Answer & Discuss (13) JAMB 1980
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