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Chemistry Past Questions

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2316

If 20 cm3 of distilled water is added to 80cm 3 of 0. 50 mol dm-3 hydrochloric acid, the new concentration of the acid will be

  • A. 0.10mol dm-3
  • B. 0.20mol dm-3
  • C. 0.40mol dm-3
  • D. 2.00mol dm-3
View Answer & Discuss (13) WAEC 2006
2317
Consider the reaction represented by the equation. 2NaHCO3(s) \(\rightarrow\) 2Na2CO 3(S) + CO 2(g) + H2O(g) what volume of carbon (IV)oxide at s.t.p is evolved when 0. 5 moles of NaHCO3 is heated? [Molar volume = 22.4 dm3 at s.t. p]
  • A. 1.12dm3
  • B. 2.24dm3
  • C. 5.6dm3
  • D. 56.0dm3
View Answer & Discuss (2) WAEC 2006
2318
Considered the reaction: H+(aq) + OH - (aq) → H2O
(l). The energy change taking place in the reaction above is enthalpy of
  • A. formation
  • B. hydration
  • C. neutralization
  • D. solution
View Answer & Discuss WAEC 2006
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2319
Which of the following processes is an endothermic reaction?
  • A. Dissolving NH4CI crystals in water
  • B. Addition of concentrated H2SO4
  • C. Dissolving NaOH pellets in water
  • D. Passing SO3 gas into water
View Answer & Discuss (2) WAEC 2006
2320
Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?
  • A. Conductivity measurement
  • B. Measurement of pH
  • C. Measurement of heat of neutralization
  • D. Action on starch iodide paper
View Answer & Discuss WAEC 2006
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