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 271: When plastics and packaging materials made from chloroethene are burnt in the open, the mixture of gases released into the atmosphere is most likely to contain?
Options:
A) ethane
B) chlorine
C) hydrogen chloride
D) ethene
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The correct answer is C .
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Question 272: Copper metal dissolves in concentrated trioxonitrate (V) acid with the resultant evolution of
Options:
A) CO2
B) SO2
C) NO2
D) CO
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The correct answer is C .
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Question 273: Rare gases are suitable because they
Options:
A) are monoatomic
B) form ions easily
C) have duplet or octet electronic configuration in the outermost shells in their atoms
D) are volatile gases
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The correct answer is C .
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Question 274: A common characteristic between zinc and the other transition elements is the ability to
Options:
A) have variable oxidation states
B) from complex ions
C) act as a catalyst
D) from coloured ions
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The correct answer is B .
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Question 275: Argon is used in gas-filled electric lamp because it helps to?
Options:
A) prevent the reduction of the lamp fillaments
B) prevent oxidation of the lamp fillaments
C) make the lamp fillament glow brightly
D) keep the atmosphere in the lamp inert
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The correct answer is C .
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Question 276: The gas that is used for the treatment of cancer is
Options:
A) Neon
B) Radon
C) Xenon
D) Argon
Show Answer
The correct answer is B .
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Question 277: You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely
Options:
A) pass each gas into lime water
B) pass each gas into water and test with litmus paper
C) pass each gas into concentrated sulphuric acid
D) expose each gas to atmospheric air
E) expose each gas to fumes of hydrogen chloride
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The correct answer is A .
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Question 278: Three liquids X, Y and Z containing only hydrogen and carbon were burnt on a spoon. X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature?
Options:
A) X and Z
B) Y
C) X
D) Z
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The correct answer is B .
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Question 279:
What is the solubility product constant (Ksp) used for?
Options:
A) To measure the total mass of a solute that can dissolve in a solvent
B) To determine the concentration of a solute in a saturated solution
C) To calculate the solubility of a solute in a given solvent
D) To compare the solubilities of different solutes in the same solvent
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The correct answer is B .
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Question 280: How many coulombs of electricity are passed through a solution in which 6.5 amperes are allowed to run for 1.0 hour?
Options:
A) 3.90 x 102 coulombs
B) 5.50 x 103 coulombs
C) 6.54 x 103 coulombs
D) 2.34 x 104 coulombs
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The correct answer is D .