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 681: An example of an acidic oxide is
Options:
A) NO
B) CO
C) SO2
D) CuO
Show Answer
The correct answer is C .
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Question 682:
The above orbital diagram shown the electronic configuration of
Options:
A) chlorine
B) nitrogen
C) calcium
D) neon
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The correct answer is B .
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Question 683:
The most important element on the earth's crust is?
Options:
A) Nitrogen
B) Hydrogen
C) Oxygen
D) Fluorine
Show Answer
The correct answer is C .
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Question 684:
Which of the following gases will diffuse fastest when passed through a porous plug?
[H = 1, C = 12, N = 14, O = 16]
Options:
A) Propane
B) Oxygen
C) Methane
D) Ammonia
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The correct answer is C .
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Question 685: How many lone pairs of electron are there on the central atom of the H2O molecules?
Options:
A) 1
B) 2
C) 3
D) 4
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The correct answer is B .
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Question 686:
In the diagram above, mixture Y is
Options:
A) NH4NO3(s) + CaSO4(s),/sub>
B) NH4CL(s) + NaNO2(s)
C) NH4NO2(s) + Na2SO4(s)
D) NH4CL(s) + Ca(OH)2(s)
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The correct answer is D .
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Question 687: Which of the following represents saponification?
Options:
A) Reaction of carboxylic acids with sodium hydroxide
B) Reaction of alkanoates with acid
C) Reaction of alkanoates with alcohols
D) Reaction of alkanoates with sodium hydroxide
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The correct answer is D .
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Question 688: Which of the following is a measure of the average kinetic energy of the molecules of a substance?
Options:
A) Volume
B) Mass
C) Pressure
D) Temperature
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The correct answer is D .
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Question 689:
At 25o and zymase as catalyst,
C6H126 → 2C2H5OH + 2CO2 + energy
The reaction above represented by the equation above is useful in the production of
Options:
A) propanol
B) butanol
C) methanol
D) ethanol
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The correct answer is D .
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Question 690: The substance often use for vulcanization of rubber is
Options:
A) chlorine
B) hydrogen peroxide
C) sulphur
D) tetraoxosulphate (IV) acid
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The correct answer is C .