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Chemistry Past Questions

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1

The oxidation state of chlorine in potassium chlorate is?

  • A. +1
  • B. +2
  • C. +3
  • D. +5
  • E. +7
View Answer & Discuss (140) JAMB 1978
2

In which of the following reactions can the oxidation number of the nitrogen be said to have increased?

  • A. 2NO(g) + O2(g) → 2NO2(g)
  • B. 2NO(g) + Cl2(g) → 2NOCl(l)
  • C. FeSO4(aq) + NO(g) → Fe(NO)SO4(s)
  • D. NO(g) + Br2(l) → 2NOBr(l)
View Answer & Discuss (18) JAMB 2005
3

A hydrocarbon X with a molar mass of 26 consists of 92.3% carbon. What is its molecular formular?

  • A. C2H2
  • B. C3H3
  • C. C4H4
  • D. C5H5
View Answer & Discuss (14) JAMB 2008
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4

The percentage of water of crystallization in ZnSO\(_4\).7H\(_2\)O is?
[Zn = 65, S = 32, O = 16, H = 1]

  • A. 33%
  • B. 44%
  • C. 55%
  • D. 87%
View Answer & Discuss (15) JAMB 2009
5

0.0075 mole of calcium trioxocarbonate (IV) is added to 0.015 mole of a solution of hydrochloric acid. The volume of gas evolved at s.t.p is?
[Molar volume of a gas at s.t.p = 22.4 dm3]

  • A. 224cm3
  • B. 168cm3
  • C. 112cm3
  • D. 100cm3
View Answer & Discuss (20) JAMB 2009
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