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Chemistry Past Questions

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1271

50 cm\(_3\) of gas was collected over water at 10ºC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10ºC is 5mm Hg

  • A. 49.19 cm 3
  • B. 48.87 cm 3
  • C. 48.55 cm 3
  • D. 48.23 cm 3
View Answer & Discuss (16) JAMB 2012
1272
An increase in the pressure exerted on gas at a constant temperature results in
  • A. a decrease in the number of effective collisions
  • B. a decrease in volume
  • C. an increase in the average intermolecular distance
  • D. an increase in volume
View Answer & Discuss (7) JAMB 2012
1273
2H2(g) + O2(g) → 2H2 O(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm3 of oxygen and 1000 cm3 of hydrogen are exploded in a sealed tube?
  • A. 200 cm3
  • B. 400 cm3
  • C. 600 cm3
  • D. 700 cm3
View Answer & Discuss (6) JAMB 2012
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1274
l . Evaporation. ll. Sublimation. lll. Diffusion. IV. Brownian motion.
Which of the above can correctly be listed as evidences for the particulate nature of matter?
  • A. I and lll only
  • B. ll and lV only
  • C. l, ll and lll only
  • D. l, ll, lll and lV
View Answer & Discuss (7) JAMB 2012
1275

If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?

  • A. Dative
  • B. Covalent
  • C. Ionic
  • D. Metallic
View Answer & Discuss (5) JAMB 2012
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