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Chemistry Past Questions and Answers

Waec Chemistry Questions

Question 1096:

The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is

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A Colourless
B Orange
C Pink
D Yellow

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Question 1097:

Which of the following statements about enthalpy of neutralization is correct? It

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A Is constant for a strong acid and a strong base
B Cannot be determined using calorimeter
C Has a positive value
D Is higher for strong acid and a weak base

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Question 1098:

When NH ₄CI was dissolved in water, the container was cold to touch. This implies that

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A The process is endothermic
B The process is exothermic
C NH₄CI is highly soluble in water
D NH ₄CI forms a saturated solution

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Question 1099:

Which of the following metallic oxides is amphoteric?

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A AI₂O₃
B Fe₂O₃
C MgO
D Na₂O

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Question 1100:

On evaporation to dryness, 250 cm³ of saturated solution of salt X with relative molar mass 101 gave 50.5g of the. What is the soluility of the salt?

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A 1.0 mol dm^-3
B 20 mol dm^-3
C 4.0 moldm^-3
D 5.0 moldm^-3

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