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Chemistry 1989 WAEC Past Questions

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31

50cm 3 of a saturated solution of potassium trioxonitrate (V)at 40°C contains 5.05g of the salt. What is the solubility of potassium trioxonitrate (V) at 40°C? (KNO3 = 101)

  • A. 1.0 mol dm-3
  • B. 1.5 mol dm-3
  • C. 2.0 mol dm-3
  • D. 2.5mol dm-3
  • E. 5.0mol dm-3
View Answer & Discuss (8) WAEC 1989
32
The oxidation number of chlorine is + 1 in
  • A. KCIO 3
  • B. CI 2O 7
  • C. ZnCI2
  • D. HCI
  • E. NaCIO
View Answer & Discuss (4) WAEC 1989
33

What is the voltage of the cell represented at Zn(s)/ Zn\(^{2+}\)(aq) //Cu\(^{2+}\)(aq) /Cu(s) given that for Cu\(^{2+}\)(aq)/ Cu (s) E\(^0\) = 0.337V and for Zn\(^{2+}\)(aq) /Zn(s)' E\(^0\) = - 0.763V?

  • A. +0.426V
  • B. -0.426V
  • C. -0.337V
  • D. -1.10V
  • E. +1.10V
View Answer & Discuss (6) WAEC 1989
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34

(a) Write the chemical equation for the formation of named alkanoate.

(b)(i) What are the monomers of protein called?

(ii) Write the two functional groups present in the monomers named in (b)(i) above

(iii) State the type of reaction that leads to the formation of proteins from their monomers.

View Answer & Discuss WAEC 1989
35

(a) When is a sample of water said to be hard?

(b) State one difference between temporary and permanent hardness of water

(c) Give one method of removing hardness completely from water

(d) Name two local is used for the production of soap.

 

View Answer & Discuss WAEC 1989
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