Q. In the reaction 3H2 + N2 → 2NH3, which element is reduced? (2022)
A.
H2
B.
N2
C.
NH3
D.
None
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Solution
N2 is reduced to NH3 as it gains electrons.
Correct Answer:
B
— N2
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Q. In the reaction 4Al + 3O2 → 2Al2O3, how many moles of Al2O3 are produced from 12 moles of Al?
A.
2 moles
B.
3 moles
C.
6 moles
D.
8 moles
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Solution
According to the stoichiometry, 4 moles of Al produce 2 moles of Al2O3. Therefore, 12 moles of Al will produce (12/4) x 2 = 6 moles of Al2O3.
Correct Answer:
C
— 6 moles
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, how many grams of Fe2O3 can be produced from 8 grams of Fe?
A.
16 g
B.
32 g
C.
48 g
D.
24 g
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Solution
8 g of Fe = 0.143 moles. 4 moles of Fe produce 2 moles of Fe2O3, so 0.0715 moles of Fe2O3 = 0.0715 * 160 g = 11.44 g.
Correct Answer:
C
— 48 g
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, how many moles of Fe are required to react with 6 moles of O2?
A.
4 moles
B.
6 moles
C.
8 moles
D.
12 moles
Show solution
Solution
From the balanced equation, 3 moles of O2 react with 4 moles of Fe. Therefore, 6 moles of O2 will require (4/3) * 6 = 8 moles of Fe.
Correct Answer:
C
— 8 moles
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, how many moles of Fe2O3 are produced from 12 moles of Fe?
A.
2 moles
B.
3 moles
C.
4 moles
D.
6 moles
Show solution
Solution
From the balanced equation, 4 moles of Fe produce 2 moles of Fe2O3. Therefore, 12 moles of Fe will produce (12/4) x 2 = 6 moles of Fe2O3.
Correct Answer:
C
— 4 moles
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, how many moles of Fe2O3 can be produced from 12 moles of Fe?
A.
3 moles
B.
6 moles
C.
9 moles
D.
12 moles
Show solution
Solution
From the stoichiometry, 4 moles of Fe produce 2 moles of Fe2O3. Therefore, 12 moles of Fe will produce (12/4) x 2 = 6 moles of Fe2O3.
Correct Answer:
B
— 6 moles
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, how many moles of Fe2O3 can be produced from 8 moles of Fe?
A.
2 moles
B.
4 moles
C.
6 moles
D.
8 moles
Show solution
Solution
From the balanced equation, 4 moles of Fe produce 2 moles of Fe2O3. Therefore, 8 moles of Fe will produce 4 moles of Fe2O3.
Correct Answer:
B
— 4 moles
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, what is the oxidation state of iron in Fe2O3?
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Solution
In Fe2O3, iron has an oxidation state of +3.
Correct Answer:
B
— +3
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Q. In the reaction 4Fe + 3O2 → 2Fe2O3, which element is oxidized?
A.
Fe
B.
O2
C.
Fe2O3
D.
None of the above
Show solution
Solution
Iron (Fe) is oxidized as it loses electrons to form Fe2O3.
Correct Answer:
A
— Fe
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Q. In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what will be the effect on the equilibrium if the reaction is exothermic? (2020)
A.
The equilibrium shifts to the left
B.
The equilibrium shifts to the right
C.
No effect on the equilibrium
D.
The reaction rate increases
Show solution
Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left (towards the reactants) to absorb the added heat, according to Le Chatelier's principle.
Correct Answer:
A
— The equilibrium shifts to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if H2 is removed from the system, what will happen to the equilibrium? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
Show solution
Solution
Removing H2 will shift the equilibrium to the left to produce more H2, according to Le Chatelier's principle.
Correct Answer:
B
— Shift to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if the pressure is increased, which direction will the equilibrium shift?
A.
To the left
B.
To the right
C.
No shift
D.
Depends on temperature
Show solution
Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas, which is the right side in this case.
Correct Answer:
B
— To the right
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if the temperature is decreased, what will happen to the equilibrium?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in pressure
Show solution
Solution
Decreasing the temperature for an exothermic reaction will shift the equilibrium to the right, favoring the formation of CH3OH.
Correct Answer:
A
— Shift to the right
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what effect does increasing the temperature have if the reaction is exothermic? (2020)
A.
Shifts equilibrium to the right
B.
Shifts equilibrium to the left
C.
No effect on equilibrium
D.
Increases the rate of reaction
Show solution
Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants, as the system tries to absorb the added heat.
Correct Answer:
B
— Shifts equilibrium to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what is the effect of increasing the concentration of CO? (2023)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kp
Show solution
Solution
Increasing the concentration of CO will shift the equilibrium to the right, favoring the formation of CH3OH.
Correct Answer:
A
— Shift to the right
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what will happen if H2 is removed from the system?
A.
Shift to the left
B.
Shift to the right
C.
No change
D.
Increase the rate of reaction
Show solution
Solution
Removing H2 will shift the equilibrium to the left to produce more H2, according to Le Chatelier's principle.
Correct Answer:
A
— Shift to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what will happen if H2 is removed from the system at equilibrium?
A.
Equilibrium shifts to the right
B.
Equilibrium shifts to the left
C.
No change
D.
Equilibrium constant increases
Show solution
Solution
Removing H2 will shift the equilibrium to the left to produce more H2, thus favoring the reactants.
Correct Answer:
B
— Equilibrium shifts to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what will happen if H2 is removed?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Equilibrium constant increases
Show solution
Solution
Removing H2 will shift the equilibrium to the left to produce more H2, according to Le Chatelier's principle.
Correct Answer:
B
— Shift to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what will happen if the volume of the container is decreased?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
Show solution
Solution
Decreasing the volume increases the pressure, which shifts the equilibrium to the side with fewer moles of gas, favoring the production of CH3OH.
Correct Answer:
A
— Shift to the right
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Q. In the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what happens to the equilibrium position if the pressure is increased? (2023)
A.
Shifts to the left
B.
Shifts to the right
C.
No change
D.
Depends on temperature
Show solution
Solution
Increasing the pressure shifts the equilibrium towards the side with fewer moles of gas, which in this case is the right side (2 moles of NH3).
Correct Answer:
B
— Shifts to the right
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Q. In the reaction Zn + CuSO4 → ZnSO4 + Cu, which element is oxidized?
A.
Zn
B.
Cu
C.
SO4
D.
None of the above
Show solution
Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn2+.
Correct Answer:
A
— Zn
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Q. In the reaction Zn + CuSO4 → ZnSO4 + Cu, which species is reduced?
A.
Zn
B.
CuSO4
C.
ZnSO4
D.
Cu
Show solution
Solution
Copper (Cu) is reduced as it gains electrons from zinc.
Correct Answer:
D
— Cu
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Q. In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized? (2022)
A.
Zn
B.
Cu²⁺
C.
Zn²⁺
D.
Cu
Show solution
Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn²⁺.
Correct Answer:
A
— Zn
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Q. In the reaction: 2A(g) ⇌ B(g) + C(g), if the volume of the container is decreased, what will happen?
A.
Shift to the left
B.
Shift to the right
C.
No change
D.
Depends on the temperature
Show solution
Solution
Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas, which is the left side in this case.
Correct Answer:
A
— Shift to the left
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Q. In the reaction: 2A(g) ⇌ B(g) + C(g), if the volume of the container is decreased, what will happen to the equilibrium?
A.
Shift to the left
B.
Shift to the right
C.
No change
D.
Depends on temperature
Show solution
Solution
Decreasing the volume increases the pressure, and the equilibrium will shift to the side with fewer moles of gas, which is the left side in this case.
Correct Answer:
A
— Shift to the left
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Q. In the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what effect does increasing the pressure have? (2020)
A.
Shifts equilibrium to the left
B.
Shifts equilibrium to the right
C.
No effect on equilibrium
D.
Increases the rate of reaction
Show solution
Solution
Increasing the pressure shifts the equilibrium towards the side with fewer moles of gas. In this case, it shifts to the right, producing more SO3.
Correct Answer:
B
— Shifts equilibrium to the right
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Q. In the reaction: 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens if the temperature is increased?
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kp
Show solution
Solution
If the reaction is exothermic, increasing the temperature will shift the equilibrium to the left, favoring the reactants.
Correct Answer:
B
— Shift to the left
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Q. In the realm of art, the concept of beauty is often subjective, leading to the conclusion that what one person finds appealing may be _____ to another.
A.
repulsive
B.
universal
C.
timeless
D.
transcendent
Show solution
Solution
The word 'repulsive' indicates a strong contrast to 'appealing', highlighting the subjectivity of beauty.
Correct Answer:
A
— repulsive
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Q. In the redox reaction 2Ag+ + Cu → 2Ag + Cu2+, which species is oxidized? (2022) 2022
A.
Ag+
B.
Cu
C.
Ag
D.
Cu2+
Show solution
Solution
Cu is oxidized to Cu2+ as it loses electrons in the reaction.
Correct Answer:
B
— Cu
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Q. In the redox reaction 2Ag+ + Zn → 2Ag + Zn2+, which species is oxidized? (2021)
A.
Ag+
B.
Zn
C.
Ag
D.
Zn2+
Show solution
Solution
Zn is oxidized to Zn2+ as it loses electrons.
Correct Answer:
B
— Zn
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