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Chemistry Past Questions

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2156

In the electrolysis of CuSO4(aq) using copper electrodes, the reaction at the anode is

  • A. discharge of SO4 2-
  • B. discharge of OH-
  • C. dissolution of copper electrode
  • D. evolution of oxygen
View Answer & Discuss (2) WAEC 2001
2157

A feasible cell was constructed by joining the two half cells below. Cu\(^{2+}\) (aq) + 2e\(^-\) → Cu(s) E\(^0\) = +0.34 V; Zn\({^2+}\) + 2e\(^-\) → Zn\((_s)\) E\(^0\) = - 0.76V. What is the standard e.m.f. of the cell?

  • A. - 1.1V
  • B. - 0.42V
  • C. +0.42V
  • D. +1.1V
View Answer & Discuss (6) WAEC 2001
2158

Hydrogenation of butene yields

  • A. butyne
  • B. butane
  • C. pentence
  • D. butanol
View Answer & Discuss (3) WAEC 2001
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2159

Benzene produces more soot than ethene on burning because benzene

  • A. has a higher molar mass
  • B. has a higher degree of unsaturation
  • C. undergoes substitution and addition reactions
  • D. is a liquid at room temperature
View Answer & Discuss (12) WAEC 2001
2160

One of the products of combustion of pentane in excess air is

  • A. pentanol
  • B. pentene
  • C. nitrogen (ll) oxide
  • D. carbon (IV) oxide
View Answer & Discuss WAEC 2001
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