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Chemistry JAMB Past Questions

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691
.....................P....Q.....R......S
Proton..............13....16....17.....19
Electron............13....16....17.....19
Neutron.............14....16....35.....20

Which of the four atoms P,q,R and in S in the above data can be described by the following properties relative atomic mass is greater than 30 but less than 40; it has an odd atomic number and forms a unipositive ion in solution?
  • A. P
  • B. Q
  • C. R
  • D. S
View Answer & Discuss (6) JAMB 1990
692
Which of the following terms indicates the number of bonds that can be formed by an atom?
  • A. Oxidation number
  • B. Valence
  • C. Atomic number
  • D. Electronegativity
View Answer & Discuss (14) JAMB 1990
693

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
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694
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
695
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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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts