Waec Chemistry 2011 Past Questions and Answers

Question 26:

• WAEC 2011

The initial volume of a gas at 300 K was 220 cm ³ Determine ^{[/sup]its temperature if the volume became 250 cm [sup]3}

A. 183 K
B. 264 K
C. 300 K
D. 341 K

Question 27:

• WAEC 2011

Which of the following equimolar solutions has the highest conductivity?

A. CH₃COOH_(aq)
B. H₂CO_3(aq)
C. H ₂SO _4(aq)
D. NaOH _(aq)

Question 28:

• WAEC 2011

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

A. Colourless
B. Orange
C. Pink
D. Yellow

Question 29:

• WAEC 2011

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

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

Question 30:

• WAEC 2011

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

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