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Chemistry 1991 JAMB Past Questions

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6
Calculate the volume of carbon (IV)oxide measured at s.t.p, produced when 1 kg of potassium hydrogen trioxocarbonate (IV) is totally decomposed by heat?

(G.M.V. at s.t.p 22.4 dm3, K = 39, O = 16, C = 12, H = 1)
  • A. 28 dm3
  • B. 56 dm3
  • C. 112 dm3
  • D. 196 dm3
View Answer & Discuss (3) JAMB 1991
7
A given quantity of a gas occupies a volume of 228 cm3 at a pressure of 750mm Hg. What will be its volume at atmospheric pressure?
  • A. 220 cm3
  • B. 225 cm3
  • C. 230 cm3
  • D. 235 cm3
View Answer & Discuss (6) JAMB 1991
8
A sample of a gas exerts a pressure of 8.2 atm when confined in a 2.93 dm3 container at 20°C. The number of moles of gas in the sample is?

(R = 0.082 litre atm / deg mole)
  • A. 1.00
  • B. 2.00
  • C. 3.00
  • D. 4.00
View Answer & Discuss (4) JAMB 1991
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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9

Atoms of element X (with 2 electrons in the outer shell). combine with atoms of Y (with 7 electrons in the outer shell). Which of the following statements is FALSE? The compound formed?

  • A. has formula XY
  • B. is likely to be ionic
  • C. contains X2+ ions
  • D. contains Y- ions
View Answer & Discuss (10) JAMB 1991
10

The electronic configuration of an elements is 1s22s22p63s23p3. How many unpaired electrons are there in the element?

  • A. 5
  • B. 4
  • C. 3
  • D. 2
View Answer & Discuss (13) JAMB 1991
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