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Chemistry Past Questions

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3106

Consider the following ionic equation:
Cr\(_2\)O\(_7\)\(^{2-}\) + 14H\(^+\) + ne-  → 2Cr\(^{3+}\) + 7H\(_2\)O.
The value of n in the equation is_______?

  • A. 7
  • B. 6
  • C. 3
  • D. 2
View Answer & Discuss (12) WAEC 2016
3107
Consider the following half-cell reactions.
Al(s) \(\to\) Al3+(aq) + 3e-
Cu2+(aq) + 2e- \(\to\) Cu(s)

The overall equation for the reaction is
  • A. Al(s) + Cu2+(aq) \(\to\) Al3+(aq) + Cu(s)
  • B. 2Al(s) + Cu2+(aq) \(\to\) 2Al(aq) + Cu(s)
  • C. 2Al(s) + 3Cu2+(aq) \(\to\) 3Cu(s) + 2Al3+(aq)
  • D. 3Al(s) + 2Cu2+(aq) \(\to\) Cu(s) + 3Al3+(aq)
View Answer & Discuss (1) WAEC 2016
3108
Amino acids are obtained from proteins by
  • A. Hydrolysis
  • B. Oxidation
  • C. Polymerization
  • D. Reduction
View Answer & Discuss (2) WAEC 2016
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3109

When a compound X is heated with concentrated tetraoxosulphate(VI)acid, it produces an alkene. X is an

  • A. Alkane
  • B. Alkanol
  • C. Alkanoate
  • D. Alkyne
View Answer & Discuss (2) WAEC 2016
3110
Ripening of fruits is hastened by using
  • A. Ethanol
  • B. Ethane
  • C. Ethene
  • D. Ethyne
View Answer & Discuss (3) WAEC 2016
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