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 21: Electronic configuration of an elements 13x in the subsidiary energy level is
Options:
A)
B)
C)
D)
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The correct answer is A .
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Question 22: A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging?
Options:
A) Al and Mg
B) Zn and Fe
C) Zn and Pb
D) Pb and H
E) Au and Hg
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The correct answer is A .
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Question 23: The arrangement of particles in crystal lattices can be studied using
Options:
A) X - rays
B) γ - rays
C) α - rays
D) β - rays
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The correct answer is A .
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Question 24:
(1/2)Zn2+(aq) + e- → (1/2) Zn(s)
In the reaction above, calculate the quantity of electricity required to discharge zinc.
[F = 96 500 C mol-1]
Options:
A) 0.965 * 104C
B) 4.820 * 104C
C) 9.650 * 104C
D) 48.200 * 104C
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The correct answer is C .
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Question 25: An oxidation state of or in K2CrO7
Options:
A) 7
B) 6
C) 5
D) 4
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The correct answer is B .
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Question 26: What is the correct IUPAC name for NO2-?
Options:
A) Dioxonitrate (IV) ion
B) Trioxonitrate (III) ion
C) Trioxonitrate (IV) ion
D) Dioxonitrate (II) ion
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The correct answer is D .
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Question 27:
CH3COOH(g) → H4(g) + CO2(g)
The reaction above is
Options:
A) Carboxylation
B) Decarboxylation
C) Acidification
D) Esterification
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The correct answer is B .
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Question 28: wH2SO4 + xAI(OH)3 → yH2O + = zAI2(SO4)3. The respective values of w.x.y and z in the equation above are?
Options:
A) 2,2,5 and 1
B) 3,2,5 and 2
C) 3,2,6 and 1
D) 2,2,6 and 2
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The correct answer is C .
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Question 29: If the difference in electronegativity of elements P and Q is 3.0. The bond that will be formed between them is
Options:
A) metallic
B) covalent
C) co-ordinate
D) ionic
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The correct answer is D .
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Question 30:
Which of the following could not be alkane?
Options:
A) CH
B) CH
C) CH
D) CH
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The correct answer is C .