Chemistry 2007 Objective — Question 1
Which pH value indicates a basic solution?
- A. 11Correct
- B. 3
- C. 0
- D. -1
Explanation
A pH value above 7 indicates a basic (alkaline) solution.
Post-UTME Chemistry 2007 Objective Past Questions
All 10 questions from the Post-UTME Screening (Post-UTME) Chemistry 2007 Objective paper, with the correct answer and a full explanation for each. Free, no signup needed.
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Chemistry 2007 Objective — Question 2
A measure of the degree of disorderliness in a chemical system is known as the
- A. activation energy
- B. enthalpy
- C. entropyCorrect
- D. free energy
Explanation
Entropy measures the degree of disorder in a system.
Chemistry 2007 Objective — Question 3
Oxidation is the process of
- A. gain of electrons
- B. loss of electronsCorrect
- C. gain of hydrogen
- D. loss of oxygen
Explanation
Oxidation is defined as the loss of electrons.
Chemistry 2007 Objective — Question 4
The pollution from petroleum spillage in rivers and lakes can best be dispersed by
- A. pouring detergentsCorrect
- B. passing ships through the sea
- C. pouring organic solvents
- D. evaporation
Explanation
Detergents act as dispersants for oil spills.
Chemistry 2007 Objective — Question 5
A mixture of 12g of carbon and 64g of sulfur is heated until reaction is complete and none of the reactants is left over. What mass of the compound carbon II sulfide is formed?
- A. 152g
- B. 15.2g
- C. 76gCorrect
- D. 760g
Explanation
Moles C=1, moles S=2, matching the 1:2 stoichiometry for CS2 formation. Mass CS2 = 1 x 76 = 76g.
Chemistry 2007 Objective — Question 6
Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is
- A. calcium
- B. calcium oxide
- C. calcium carbideCorrect
- D. sodium peroxide
Explanation
Calcium carbide reacts with water to give ethyne, which burns with a sooty flame.
Chemistry 2007 Objective — Question 7
A brand of ink containing cobalt (II) chloride and iron II ion can be separated into its various components by
- A. fractional crystallization
- B. fractional distillation
- C. sublimation
- D. chromatographyCorrect
Explanation
Chromatography separates the different coloured components of ink mixtures.
Chemistry 2007 Objective — Question 8
Which of the following factors does NOT affect the rate of a chemical reaction between non gaseous reactants?
- A. temperature of reaction mixture
- B. presence of catalyst
- C. surface area of reactants
- D. (fourth option not fully captured)Correct
Explanation
This item's fourth option was not fully legible in the scan; the three visible options are all recognized factors affecting reaction rate.
Chemistry 2007 Objective — Question 9
The complete oxidation of butane gives
- A. butane
- B. butanal
- C. butan-2-one
- D. butanoic acidCorrect
Explanation
Complete oxidation ultimately yields the carboxylic acid, butanoic acid.
Chemistry 2007 Objective — Question 10
The main constituents of petroleum are
- A. alkanes
- B. alkynes
- C. gases
- D. hydrocarbonsCorrect
Explanation
Petroleum is fundamentally a complex mixture of hydrocarbons.
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