LIKELY QUESTIONS FOR WAEC*2017: Trial Chemistry Questions*

*EDUCATIONAL LEAKS*

*2017 Trial Chemistry Questions*


1. (a) (i) State Boyle’s law.
ii) Give the mathematical expression of Boyle’s law.
iii) Give two reasons why real gases deviate from ideal gas behavior.
iv) State:
#) three postulates of the kinetic theory of gases;
#) Dalton’s law of partial pressures
2. (a) (i) What is an acid-base indicator?
(ii) When is an indicator said to be most suitable for an acid-bas titration?
(iii) Consider the acid-base titration reaction represented by the following equation:
NaOH(aq) + CH3COOH(aq) CH3COONa(aq) + H2O(l)
I. Name a suitable indicator for the reaction.
II. Explain briefly your answer in 3(a)(ii) I.
(b) (i) Write the ionic equation for the reaction between zinc and silver trioxonitrate (V)
solution.
(ii) Which type of reaction occurs between zinc and silver trioxonitrate (V) solution?
Give a reason for your answer.
(c) (i) Consider the reaction represented by the following equation:
CaCO3(s) + 2HCl(aq) CaCl2(aq) + CO2(g) + H2O(l).
State three factors that could increase the rate of the reaction.

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a). Explain briefly the observation that increase in temperature generally
increases the rate of reaction.
d). (i) What is solubility?
(ii) Distinguish between saturated solution and unsaturated solution.
ii). A saturated solution of volume 10 cm3 yielded 0.06 g of its dry salt at 25oC.
Calculate the solubility of the salt in gdm-3.
3. a). (i) Define hybridization ?
(ii) State the type(s) of hybridization exhibited by carbon in propene.
(iii) Mention the shape of the
1. s-orbital;
2. p-orbital.
b). Diamond and graphite are both allotropes of carbon. Diamond is hard while graphite is soft. Explain briefly this observation.
c). A monochloroalkane was analysed by converting all the chlorine into chloride ions and precipitating the chloride as silver chloride. If 0.08226g of the chloroalkane gave 0.1837g of silver chloride,
d). calculate the molecular mass of the chloroakane;
(ii) determine the molecular formula of the chloroalkane;
(iii) draw the structure of the chloroakane and name it.
[ H = 1.00; C = 12.0; Cl = 35.5; Ag = 108.0 ]

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