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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 846:

Which of the following processes is an endothermic reaction?

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A Dissolving NH₄CI crystals in water
B Addition of concentrated H₂SO₄
C Dissolving NaOH pellets in water
D Passing SO₃ gas into water

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Question 847:

Which of the following aqueous methods cannot be used to distinguish between a strong acid and a a weak acid?

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A Conductivity measurement
B Measurement of pH
C Measurement of heat of neutralization
D Action on starch iodide paper

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Question 848:

The indicator used in neutralizing CH₃COOH and NaOH solution has pH range of

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A 3-5
B 7-8
C 8-10³
D 10-12

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Question 849:

When aqueous ammonia is added to one of the following solutions,a white precipitate which dissolved in excess ammonia is formed Identify the solution.

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A ZnCl_2(aq)
B Pb(NO₃)_2(aq)
C CuSO_4(aq)
D FeSO_4(aq)

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Question 850:

Which of the following compounds absorbs moisture from the atmosphere and dissolves in it?

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A FeCI₃
B MgSO₄.7H₂O
C Na₂SO ₄
D KCI

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