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 711: Which of the following pair of gases will NOT react further with oxygen at a temperature between 30oC AND 400oC
Options:
A) SO2 and NH3
B) CO2 and H2
C) NO2 and SO3
D) SO3 and NO
E) CO and H2
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The correct answer is C .
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Question 712: The hydrocarbon used in the production of styrene is
Options:
A) ethyne
B) propyne
C) ethane
D) ethene
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The correct answer is D .
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Question 713:
What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reversed?
Options:
A) It becomes zero
B) It becomes negative
C) It remains the same
D) It becomes the reciprocal of the original value
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The correct answer is D .
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Question 714: A certain liquid has a high boiling point. It is viscous, non-toxic, miscible with water being very hygroscopic. This liquid is most likely to be?
Options:
A) CH3CH2CH2HO
B) CH3CHOHCH3
C) CH3CH2CHOHCH3
D) CH2OHCHOHCH2OH
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The correct answer is D .
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Question 715: The property of chlorine which causes hydrogen chloride to be more ionic than the chlorine molecules is its
Options:
A) electrovalency
B) electron affinity
C) electropositivity
D) electronegativity
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The correct answer is D .
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Question 716: In the preparation of some pure crystals of Cu (NO3)2 starting with CuO, a student gave the following statements as steps he employed. Which of these shows a flaw in his report ?
Options:
A) some CuO was reacted with excess dilute H2SO4
B) the solution was concentrated
C) when the concentrate was cooled, crystals formed were removed by filtration
D) the crystals were washed with very little cold water
E) the crystals were then allowed to dry
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The correct answer is A .
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Question 717:
In the diagram above , the activation energy for the backward reaction is
Options:
A) +5kJ
B) +15KJ
C) +25KJ
D) +30KJ
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The correct answer is C .
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Question 718: The efficiency of a solid catalyst to increase reaction rates depends on its
Options:
A) surface area
B) solubility
C) concentration
D) quantity
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The correct answer is A .
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Question 719: Which of the following is an example of a mixture?
Options:
A) Common salt
B) Blood
C) Sand
D) Washing soda
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The correct answer is B .
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Question 720: Which of the following ion’s requires the quantity of electricity for discharge at an electrode
Options:
A) 2.0 mole of Q3+
B) 2.5 mole of R2+
C) 3.0 mole of T-
D) 4.0 mole of Y-
Show Answer
The correct answer is A .