Chemistry is the study of the substances that make up matter. It looks at their properties, how they react with each other, and how these reactions can create new substances.
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Question 21: Catalytic hydrogenation of benzene produces?
Options:
A) an aromatic hydrocarbon
B) margarine
C) cyclohexane
D) D.D.T
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The correct answer is C .
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Question 22: When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
Options:
A) 2.0 mol dm-3
B) 3.5 mol dm-3
C) 7.0 mol dm-3
D) 10.0 mol dm-3
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The correct answer is A .
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Question 23:
What is eutrophication?
Options:
A) The release of harmful chemicals into water bodies
B) The excessive growth of algae due to nutrient enrichment
C) The presence of heavy metals in water
D) The formation of oil slicks on water surfaces
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The correct answer is B .
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Question 24: 50 cm3 of gas was collected over water at 10oC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10 oC is 5mm Hg
Options:
A) 49.19 cm 3
B) 48.87 cm 3
C) 48.55 cm 3
D) 48.23 cm 3
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The correct answer is D .
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Question 25: Three drops of a 1.0 mol dm-3 solution of HCl was added to 20 cm3 of a solution of pH6.4. The pH of the resulting solution will be
Options:
A) close to that of pure water
B) less than 6.4
C) greater than 6.4
D) unaltered
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The correct answer is B .
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Question 26: Methylethanoate reacts with ammonia to yield?
Options:
A) mettylamine and ethanol
B) ethylamine and methanol
C) methanamide and ethanol
D) ethanamide and methanol
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The correct answer is D .
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Question 27: PCL5(g)= PCL3(g) + Cl2(g)In the reaction above, a decrease in pressure will
Options:
A) Decelerate the reaction
B) Increase yield of Pcl3
C) Increase the yield of Pcl5
D) Accurate the reaction
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The correct answer is B .
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Question 28: Element X, Y and Z belong to a groups I, V and VII respectively. Which of the following is TRUE about the bond types of XZ and YZ3?
Options:
A) Both are electrovalent
B) Both are covalent
C) XZ is electrovalent and YZ3 is covalent
D) XZ is covalent and YZ3 is electrovalent
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The correct answer is C .
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Question 29:

The compound above is an
Options:
A) alkanone
B) alkanoate
C) alkanal
D) akanol
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The correct answer is A .
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Question 30: The compounds CH3CH2CHO and CH3COCH3 can be distinguished from each other using
Options:
A) Dilute ammonia
B) Benedict's solution
C) Tollen's reagent
D) Sodium hydroxide solution
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The correct answer is C .