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 151: A jet plane carrying 3,000 kg of ethane burns off all the gas forming water and carbondioxide. if all the carbondioxide is expelled and all the water formed is condensed and kept on board the plane, then the gain in weight is
Options:
A) 1,800 kg
B) 900 kg
C) 600 kg
D) 2, 400 kg
E) 1, 200 kg
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The correct answer is D .
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Question 152: An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the
Options:
A) law of multiple proportions
B) law of chemical proportions
C) law of simple proportions
D) law of conservation of mass
E) law of definite proportions
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The correct answer is A .
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Question 153: The enzymes responsible for converting sucrose into two simple isomeric sugars is
Options:
A) maltase
B) amylase
C) invertase
D) lactase
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The correct answer is C .
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Question 154:
The presence of ammonia gas in a desiccator can exclusively be removed by
Options:
A) phosphorus (V) oxide
B) fused calcium chloride
C) calcium chloride
D) concentrated tetraoxosulphate (VI) acid
Show Answer
The correct answer is D .
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Question 155: Which of the following are made by the process of polymerization?
Options:
A) Nylon and soap
B) Nylon and artificial rubber
C) Soap and butane
D) Margarine and nylon
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The correct answer is B .
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Question 156: The principal constituent of natural gas is
Options:
A) methane
B) ethane
C) propane
D) butane
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The correct answer is A .
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Question 157:
What is the sum of the oxidation numbers in a neutral compound?
Options:
A) +2
B) -1
C) 0
D) +1
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The correct answer is C .
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Question 158:
An unknown organic compound X has a relative molecular mass of 180. It is a colourless crystaline solid, readily soluble in water. X contains the elements C, H and O in the atomic ratio 1: 2:1. The compound has a sweet teste and melts on heating. In the presence of yeast and in the absence of air, X is converted to compound Y and a colourless gas. Compound Y reacts with sodium metal to produce a gas Z which gives a 'pop' sound with a glowing splint. Y also reacts with ethanoic acid to give a sweet smelling compound W.
Compound W is
Options:
A) a soap
B) an oil
C) an alkane
D) an ester
E) sucrose
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The correct answer is D .
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Question 159:
The derivative of benzene that can be used in making explosives is
Options:
A) aniline
B) xylene
C) phenol
D) toluene
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The correct answer is C .
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Question 160: The furring of kettles is caused by the presence in water of
Options:
A) calcium hydrogentrioxocarbonate (IV)
B) calcium trioxocarbonate (IV)
C) calcium tetraoxosulphate (VI)
D) calcium hydroxide
Show Answer
The correct answer is B .