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 171:
An organic compound which decolorizes bromine water is likely to be?
Options:
A) CH
B) CH
C) CH
D) CH
Show Answer
The correct answer is D .
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Question 172: 25cm3 of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air
Options:
A) 2,500 cm3
B) 1250 cm3
C) 125 cm3
D) 80 cm3
Show Answer
The correct answer is A .
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Question 173:
The two ions responsible for hardness in water are
Options:
A) Ca and / or Mg
B) K and / or Mg
C) Ca and / or Li
D) Ca and / or Na
Show Answer
The correct answer is A .
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Question 174: Which of the following substances are all made by the process of polymerization?
Options:
A) Nylon and soap
B) Ethanoic acid margarine and ethanol
C) Nylon and artificial rubber
D) Soap and butane
E) Margarine and nylon
Show Answer
The correct answer is C .
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Question 175:

In the experiment above, X is a mixture of nitrogen, carbon (IV) oxide and
Options:
A) water
B) impurities
C) inert gas
D) oxygen
Show Answer
The correct answer is C .
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Question 176: Which of the following separation processes is most likely to yield high quality ethanol (>95%) from palm wine?
Options:
A) Fractional distillation without a dehydrant
B) simple distillation with a dehydrant
C) fractional distillation with a dehydrant
D) column chromatography
E) evaporation
Show Answer
The correct answer is C .
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Question 177: The reaction Mg + H2O → MgO + H2 takes place only in the presence of?
Options:
A) excess Mg ribbon
B) excess cold water
C) very hot water
D) steam
Show Answer
The correct answer is D .
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Question 178: Which of the following equations represents an oxidizing action of sulphur dioxide?
Options:
A) SO2 + 2HNO2 → H2SO4 + 2NO2 + heat
B) 2SO2 + 2H2O + O2 → 2H2SO4
C) SO2 + 2H2O + CI2 → H2SO4 + 2HCI
D) SO2 + 2H2S → 3S + 2H2O
E) K2Cr2O7 + H2SO4 + 3SO2 → K2SO4 + Cr2(SO4)3 + H2O
Show Answer
The correct answer is D .
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Question 179: Which of the following types of reactions takes place between C2H4 and the halogens?
Options:
A) Substitution
B) Polymerization
C) Addition
D) Saponification
E) Oxidation
Show Answer
The correct answer is C .
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Question 180:
Calculate the volume in cm3 of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s
{F = 96500 Cmol-1, Molar volume of a gas at s.t.p. = 22.4 dm3}
Options:
A) 224.000 dm3
B) 0.056 dm3
C) 0.224 dm3
D) 56.000 dm3
Show Answer
The correct answer is B .