Q. In the molecular orbital theory, which of the following orbitals is lower in energy for homonuclear diatomic molecules?
-
A.
σ2p
-
B.
π2p
-
C.
σ2s
-
D.
π2s
Solution
The σ2s orbital is lower in energy than the π2p and σ2p orbitals in homonuclear diatomic molecules.
Correct Answer: C — σ2s
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Q. In the molecular orbital theory, which of the following orbitals is lower in energy than the 2p orbitals?
Solution
The 2s molecular orbitals are lower in energy than the 2p molecular orbitals.
Correct Answer: A — 2s
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Q. In the molecular orbital theory, which of the following orbitals is the highest occupied molecular orbital (HOMO) in O2?
-
A.
σ2p
-
B.
π2p
-
C.
σ*2p
-
D.
π*2p
Solution
In O2, the highest occupied molecular orbital (HOMO) is π2p.
Correct Answer: B — π2p
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Q. In the molecular orbital theory, which of the following orbitals is the highest energy in O2?
-
A.
σ2p
-
B.
π2p
-
C.
σ*2p
-
D.
π*2p
Solution
The highest energy orbital in O2 is σ*2p, which is an antibonding orbital.
Correct Answer: C — σ*2p
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Q. In the molecular orbital theory, which of the following pairs of orbitals can combine to form a sigma bond?
-
A.
s and p
-
B.
p and p
-
C.
s and s
-
D.
d and p
Solution
s and s orbitals can combine to form a sigma bond.
Correct Answer: C — s and s
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Q. In the molecular orbital theory, which orbitals combine to form sigma bonds?
-
A.
s and p orbitals
-
B.
p and d orbitals
-
C.
s orbitals only
-
D.
p orbitals only
Solution
Sigma bonds are formed by the head-on overlap of s and p orbitals.
Correct Answer: A — s and p orbitals
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Q. In the reaction 2Ag+ + Zn → 2Ag + Zn2+, which species is oxidized?
-
A.
Ag+
-
B.
Zn
-
C.
Ag
-
D.
Zn2+
Solution
Zinc (Zn) is oxidized to Zn2+.
Correct Answer: B — Zn
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Q. In the reaction 2Ag+ + Zn → 2Ag + Zn2+, which species is reduced?
-
A.
Ag+
-
B.
Zn
-
C.
Ag
-
D.
Zn2+
Solution
Ag+ is reduced as it gains electrons to form Ag.
Correct Answer: A — Ag+
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Q. In the reaction 2AgNO3 + Cu → 2Ag + Cu(NO3)2, what is the oxidation state of silver in AgNO3?
Solution
In AgNO3, silver has an oxidation state of +1.
Correct Answer: A — +1
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Q. In the reaction 2Ag^+ + Zn → 2Ag + Zn^2+, what is the oxidation state change for zinc?
-
A.
0 to +2
-
B.
+2 to 0
-
C.
+2 to +1
-
D.
0 to -1
Solution
Zinc is oxidized from an oxidation state of 0 to +2.
Correct Answer: A — 0 to +2
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Q. In the reaction 2Cr2O7^2- + 14H+ + 6e^- → 4Cr^3+ + 7H2O, what is the role of Cr2O7^2-?
-
A.
Oxidizing agent
-
B.
Reducing agent
-
C.
Neutral agent
-
D.
None of the above
Solution
Cr2O7^2- is reduced to Cr^3+, making it the oxidizing agent.
Correct Answer: A — Oxidizing agent
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Q. In the reaction 2Fe + 3Cl2 → 2FeCl3, how many grams of FeCl3 can be produced from 10 g of Fe?
-
A.
20 g
-
B.
30 g
-
C.
40 g
-
D.
50 g
Solution
10 g of Fe = 0.18 moles. 2 moles of Fe produce 2 moles of FeCl3. 0.18 moles of FeCl3 = 0.18 * 162.5 g = 29.25 g.
Correct Answer: C — 40 g
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Q. In the reaction 2Fe + 3Cl2 → 2FeCl3, how many grams of FeCl3 can be produced from 4 grams of Fe?
-
A.
12 g
-
B.
20 g
-
C.
30 g
-
D.
40 g
Solution
4 g of Fe = 0.071 moles. 0.071 moles of Fe produce 0.071 * 2 = 0.142 moles of FeCl3 = 0.142 * 162.5 g = 23 g.
Correct Answer: B — 20 g
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Q. In the reaction 2Fe + 3Cl2 → 2FeCl3, how many grams of FeCl3 can be produced from 4 moles of Fe?
-
A.
315.5 g
-
B.
267 g
-
C.
200 g
-
D.
150 g
Solution
4 moles of Fe produce 4 moles of FeCl3. Mass of FeCl3 = 4 moles * 162.5 g/mole = 650 g.
Correct Answer: A — 315.5 g
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Q. In the reaction 2Fe + 3Cl2 → 2FeCl3, how many moles of Cl2 are needed to react with 4 moles of Fe?
-
A.
3 moles
-
B.
6 moles
-
C.
4 moles
-
D.
2 moles
Solution
According to the stoichiometry, 2 moles of Fe require 3 moles of Cl2. Therefore, 4 moles of Fe will require 6 moles of Cl2.
Correct Answer: B — 6 moles
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Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, what is being oxidized?
-
A.
Fe2O3
-
B.
C
-
C.
Fe
-
D.
CO2
Solution
Carbon (C) is being oxidized to carbon dioxide (CO2).
Correct Answer: B — C
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Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, what is being reduced?
-
A.
Fe2O3
-
B.
C
-
C.
Fe
-
D.
CO2
Solution
Fe2O3 is being reduced to Fe as it gains electrons.
Correct Answer: A — Fe2O3
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Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, which element is oxidized?
-
A.
Iron
-
B.
Carbon
-
C.
Oxygen
-
D.
None
Solution
Carbon is oxidized as it loses electrons to form CO2.
Correct Answer: B — Carbon
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Q. In the reaction 2Fe^3+ + 2I^- → 2Fe^2+ + I2, which species is the reducing agent?
-
A.
Fe^3+
-
B.
I^-
-
C.
Fe^2+
-
D.
I2
Solution
I^- donates electrons to Fe^3+, thus it is the reducing agent.
Correct Answer: B — I^-
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Q. In the reaction 2H2 + O2 → 2H2O, how many grams of oxygen are required to completely react with 4 grams of hydrogen?
-
A.
16 g
-
B.
8 g
-
C.
32 g
-
D.
4 g
Solution
4 g of H2 = 2 moles. 1 mole of O2 is needed for 2 moles of H2, so 1 mole of O2 = 32 g is required.
Correct Answer: B — 8 g
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Q. In the reaction 2H2 + O2 → 2H2O, how many grams of oxygen are required to react with 4 grams of hydrogen?
-
A.
16 g
-
B.
8 g
-
C.
4 g
-
D.
2 g
Solution
First, calculate moles of H2: 4 g / 2 g/mol = 2 moles. From the reaction, 2 moles of H2 require 1 mole of O2. Therefore, 2 moles of O2 = 32 g.
Correct Answer: B — 8 g
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Q. In the reaction 2H2 + O2 → 2H2O, how many grams of water are produced from 4 grams of hydrogen?
-
A.
18 g
-
B.
36 g
-
C.
54 g
-
D.
72 g
Solution
4 grams of H2 is 2 moles (4 g / 2 g/mol). According to the equation, 2 moles of H2 produce 2 moles of H2O, which is 36 g (2 moles x 18 g/mol).
Correct Answer: B — 36 g
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Q. In the reaction 2H2 + O2 → 2H2O, how many grams of water can be produced from 4 grams of hydrogen?
-
A.
36 g
-
B.
18 g
-
C.
72 g
-
D.
9 g
Solution
4 g of H2 = 2 moles. 2 moles of H2 produce 2 moles of H2O = 2 * 18 g = 36 g.
Correct Answer: A — 36 g
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Q. In the reaction 2H2 + O2 → 2H2O, how many liters of H2O vapor are produced from 4 liters of H2?
-
A.
4 L
-
B.
8 L
-
C.
2 L
-
D.
6 L
Solution
4 L of H2 produces 4 L of H2O vapor at STP.
Correct Answer: B — 8 L
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Q. In the reaction 2H2 + O2 → 2H2O, how many liters of water vapor are produced from 4 liters of hydrogen at STP?
-
A.
4 L
-
B.
8 L
-
C.
2 L
-
D.
6 L
Solution
4 L of H2 produces 4 L of H2O since the ratio is 1:1.
Correct Answer: B — 8 L
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Q. In the reaction 2H2 + O2 → 2H2O, how many moles of O2 are required to completely react with 6 moles of H2?
-
A.
2 moles
-
B.
3 moles
-
C.
4 moles
-
D.
6 moles
Solution
From the balanced equation, 2 moles of H2 require 1 mole of O2. Therefore, 6 moles of H2 will require (6/2) = 3 moles of O2.
Correct Answer: B — 3 moles
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Q. In the reaction 2H2 + O2 → 2H2O, how many moles of O2 are required to react with 6 moles of H2?
-
A.
3 moles
-
B.
4 moles
-
C.
6 moles
-
D.
2 moles
Solution
According to the stoichiometry of the reaction, 2 moles of H2 require 1 mole of O2. Therefore, 6 moles of H2 will require (6/2) = 3 moles of O2.
Correct Answer: A — 3 moles
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Q. In the reaction 2H2 + O2 → 2H2O, how many moles of water are produced from 4 moles of hydrogen?
-
A.
2 moles
-
B.
4 moles
-
C.
6 moles
-
D.
8 moles
Solution
According to the stoichiometry of the reaction, 2 moles of H2 produce 2 moles of H2O. Therefore, 4 moles of H2 will produce 4 moles of H2O.
Correct Answer: B — 4 moles
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Q. In the reaction 2H2 + O2 → 2H2O, if 3 moles of O2 are available, how many moles of H2 are required?
-
A.
3 moles
-
B.
6 moles
-
C.
1.5 moles
-
D.
4.5 moles
Solution
According to the stoichiometry, 1 mole of O2 requires 2 moles of H2. Therefore, 3 moles of O2 will require 3 x 2 = 6 moles of H2.
Correct Answer: B — 6 moles
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Q. In the reaction 2H2 + O2 → 2H2O, if you start with 3 moles of O2, how many moles of H2 are required?
-
A.
3 moles
-
B.
6 moles
-
C.
1.5 moles
-
D.
4 moles
Solution
According to the stoichiometry, 1 mole of O2 requires 2 moles of H2. Therefore, 3 moles of O2 will require 6 moles of H2.
Correct Answer: B — 6 moles
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