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 1:
Which of the following is a unique property of water compared to other liquids?
Options:
A) It is a poor solvent
B) It does not evaporate
C) It expands when freezing
D) It has a low heat capacity
Show Answer
The correct answer is C .
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Question 2: Lucas reagent is used to test for
Options:
A) alkanes
B) alkanoic acids
C) alkanols
D) amines
Show Answer
The correct answer is C .
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Question 3: Which of the following compounds is a base?
Options:
A) CO2
B) CaO
C) H3PO3
D) CH3COOCH3
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The correct answer is B .
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Question 4:
In the reaction:
2Hl(g) ↔ H2(g) + l2(g)' ΔH = 10 kj;
The concentration of iodine in the equilibrium mixture can be increased by?
Options:
A) raising the pressure
B) raising the temperature
C) adding a catalyst
D) lowering the pressure
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The correct answer is B .
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Question 5: A gas sample with an initial volume of 3.25 dm3 is heated and allowed to expand to 9.75 dm3 at constant pressure. What is the ratio of the final absolute temperature to the initial absolute temperature?
Options:
A) 3:1
B) 5:2
C) 5:4
D) 8:3
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The correct answer is A .
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Question 6: In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?
Options:
A) The additional of the two is expected to be one
B) The product of the two is expected to be one
C) The two equilibrium constants are identical
D) The product of the two is always greater than one
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The correct answer is A .
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Question 7: In the extraction of iron in the blast furnace, limestone is used to?
Options:
A) release CO2 for the reaction
B) reduce the iron ore
C) increase the strenght of the iron
D) remove impurities
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The correct answer is D .
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Question 8: Which of the following compounds can be represented by the molecular formula C2 H6O?
Options:
A) propanal
B) ethanol
C) methanoic acid
D) glucose
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The correct answer is B .
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Question 9: To obtain pure carbon (II) oxide from its mixture with carbon (IV) oxide, the mixture should be
Options:
A) passed over heated copper (II) oxide
B) bubbled through water
C) bubbled through concentrated tetroxosulphate (VI) acid
D) bubbled through sodium hydroxide
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The correct answer is D .
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Question 10: A reaction takes places spontaneously if?
Options:
A) ∆G = O
B) ∆S < O and ∆H > O
C) ∆H < T ∆S
D) ∆G > O
Show Answer
The correct answer is C .