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6

In which of the following is the entropy change positive?

  • A. Thermal dissociation of ammonium chloride
  • B. Reaction between an acid and a base
  • C. Addition of concentrated acid to water
  • D. Dissolution of sodium metal in water
View Answer & Discuss (8) JAMB 2010
7

If a reaction is exothermic and there is a great disorder, it means that?

  • A. the reaction is static
  • B. the reaction is in a state of equilibrium
  • C. there will be a large increase in free energy
  • D. there will be a large decrease in free energy
View Answer & Discuss (9) JAMB 2010
8

2H2(g) + O2(g) ⇌ 2H2O(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?

  • A. it is unaffected
  • B. it becomes zero
  • C. it decrease
  • D. it increase
View Answer & Discuss (7) JAMB 2010
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9

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
10

Study carefully the reaction represented by the equation below. 2H2O 2(l) → O 2(g) + 2H2O(l). Which of the following will not reaction increase the reaction rate?

  • A. Heating the hydrogen peroxide
  • B. Adding a pinch of MnO2 to the reactant
  • C. increasing the concentration of the H2O2
  • D. Adding water to the reactant
  • E. Exposing the reactant to sunlight
View Answer & Discuss (3) WAEC 1992
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