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Chemistry 1991 JAMB Past Questions

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26
Magnesium (IV) oxide is known to hasten the decomposition of hydrogen peroxide. Its main action is to?
  • A. increase the surface area of the reactants
  • B. increase the concntration of the reactants
  • C. lower the activation energy for the reaction
  • D. lower the heat of reaction, ∆H, for the reaction
View Answer & Discuss JAMB 1991
27

1.1 g of CaCI2 dissolved in 50 cm3 of water caused a rise in temperature of 3.4°C. The heat of reaction, ∆H for CaCI2 in kj per mole is?

(Ca = 40, CI = 35.5, specific heat of water is 4.18 jk-1)

  • A. -71.1
  • B. -4.18
  • C. +71.1
  • D. +111.0
View Answer & Discuss (20) JAMB 1991
28

NO(g) + CO(g) ↔ (1)/(2)N2(g) + CO2(g) ∆H = 89.3 kj.
What conditions would favour maximum conversion of nitrogen (II) oxide and carbon (II) oxide in the reaction above?

  • A. Low temperature and high pressure
  • B. High temperature and low pressure
  • C. High temperature and high pressure
  • D. Low temperature and low pressure
View Answer & Discuss (21) JAMB 1991
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29

Which of the following equilibria is unaffected by a pressure change?

  • A. 2NaCI(s) ↔ 2Na (I) + CI2(g)
  • B. H 2(g) + I2(g) ↔ 2HI(g)
  • C. 2O3(g) ↔ 3O2(g)
  • D. 2NO2(g) ↔ N2O4(g)
View Answer & Discuss (26) JAMB 1991
30
Which of the following gases will rekindle a brightly glowing splint?
  • A. NO2
  • B. NO
  • C. N2O
  • D. CI2
View Answer & Discuss (7) JAMB 1991
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