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Chemistry 1990 JAMB Past Questions

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31

X(g) → X\(^-\)(g). The type of energy involved in the above transformation is?

  • A. ionization energy
  • B. sublimation energy
  • C. lattice energy
  • D. electron affinity
View Answer & Discuss (11) JAMB 1990
32
Chlorine, consisting of two isotopes of mass numbers 35 and 37, has an atomic mass of 35.5.
The relative abundance of the isotope of mass number 37 is?
  • A. 20
  • B. 25
  • C. 50
  • D. 75
View Answer & Discuss (15) JAMB 1990
33
10.0 dm3 of air containing H2S as an impurity was passed through a solution of Pb(NO3)2 until all the H2S had reacted. The precipitate of PbS was found to weigh 5.02 g. According to the equation:

Pb(NO3)2 + H2S → PbS + 2HNO3 the percentage by volume of hydrogen sulphide in the air is?



(Pb = 207, S = 32, GMV at s.t.p = 22.4dm3)
  • A. 50.2
  • B. 47.0
  • C. 4.70
  • D. 0.47
View Answer & Discuss (16) JAMB 1990
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34

A blue solid, T, which weighed 5.0g was placed on a table. After 8 hours, the resulting pink solid was found to weigh 5.5g. It can be inferred that substance T?

  • A. is deliquescent
  • B. is hygroscopic
  • C. has some molecules of water of crystallization
  • D. is efflorescent
View Answer & Discuss (27) JAMB 1990
35
The solubility in moles per dm3 of 20g of CuSO4 dissolve in 100 of water at 180°C is?

(Cu = 63.5, S = 32, O = 16)
  • A. 0.13
  • B. 0.25
  • C. 1.25
  • D. 2.00
View Answer & Discuss (7) JAMB 1990
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