Q. In the reaction 4Fe + 3O2 → 2Fe2O3, which element is oxidized?
A.
Fe
B.
O2
C.
Fe2O3
D.
None of the above
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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
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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
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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 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
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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 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
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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 species is reduced?
A.
Zn
B.
CuSO4
C.
ZnSO4
D.
Cu
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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
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Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn²⁺.
Correct Answer:
A
— Zn
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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 redox reaction 2Ag+ + Cu → 2Ag + Cu2+, which species is oxidized? (2022) 2022
A.
Ag+
B.
Cu
C.
Ag
D.
Cu2+
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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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Q. In the redox reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O, what is the oxidation state of carbon in C2O4^2-?
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Solution
In C2O4^2-, the oxidation state of carbon is +3.
Correct Answer:
C
— +4
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Q. In thermodynamics, the term 'adiabatic' refers to a process that: (2019)
A.
Occurs at constant temperature
B.
Occurs without heat transfer
C.
Occurs at constant pressure
D.
Occurs at constant volume
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Solution
An adiabatic process is one in which no heat is transferred to or from the system, meaning it occurs without heat exchange.
Correct Answer:
B
— Occurs without heat transfer
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Q. In thermodynamics, the term 'enthalpy' is defined as: (2022)
A.
The total energy of a system
B.
The heat content of a system at constant pressure
C.
The work done by a system
D.
The change in internal energy
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Solution
Enthalpy is defined as the heat content of a system at constant pressure, represented as H = U + PV.
Correct Answer:
B
— The heat content of a system at constant pressure
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Q. In thermodynamics, the term 'system' refers to: (2022)
A.
The surroundings
B.
The part of the universe under study
C.
The entire universe
D.
None of the above
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Solution
In thermodynamics, the 'system' refers to the part of the universe that is being studied, while the surroundings are everything else.
Correct Answer:
B
— The part of the universe under study
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Q. In thermodynamics, what does the term 'enthalpy' (H) represent? (2020)
A.
Total energy of the system
B.
Energy required to break bonds
C.
Heat content of the system at constant pressure
D.
Work done by the system
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Solution
Enthalpy (H) represents the heat content of the system at constant pressure, defined as H = U + PV.
Correct Answer:
C
— Heat content of the system at constant pressure
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Q. In thin film interference, which of the following will cause a shift in the interference pattern? (2022)
A.
Change in wavelength
B.
Change in film thickness
C.
Change in angle of incidence
D.
All of the above
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Solution
All these factors can affect the path difference and thus shift the interference pattern in thin film interference.
Correct Answer:
D
— All of the above
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Q. In thin film interference, which of the following will not affect the interference pattern? (2022)
A.
Thickness of the film
B.
Wavelength of light
C.
Angle of incidence
D.
Color of the light source
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Solution
While thickness, wavelength, and angle of incidence affect the interference pattern, the color of the light source does not directly affect the pattern itself.
Correct Answer:
D
— Color of the light source
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Q. In which case does total internal reflection occur? (2022)
A.
When light travels from a denser to a rarer medium
B.
When light travels from a rarer to a denser medium
C.
At the critical angle
D.
None of the above
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Solution
Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.
Correct Answer:
A
— When light travels from a denser to a rarer medium
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Q. In which direction does the magnetic field line emerge from a bar magnet? (2022)
A.
From North to South
B.
From South to North
C.
In a circular path
D.
Randomly
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Solution
Magnetic field lines emerge from the north pole and enter the south pole of a bar magnet.
Correct Answer:
A
— From North to South
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Q. In which direction does the magnetic field point inside a solenoid carrying current? (2023)
A.
From south to north
B.
From north to south
C.
Perpendicular to the axis
D.
It is zero
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Solution
Inside a solenoid, the magnetic field lines run from the north pole to the south pole, similar to a bar magnet.
Correct Answer:
B
— From north to south
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Q. In which group of plants do we find true roots, stems, and leaves? (2021)
A.
Bryophytes
B.
Pteridophytes
C.
Algae
D.
Fungi
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Solution
Pteridophytes possess true roots, stems, and leaves, distinguishing them from bryophytes.
Correct Answer:
B
— Pteridophytes
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Q. In which group of plants do you find the presence of true leaves, stems, and roots? (2020)
A.
Bryophytes
B.
Pteridophytes
C.
Gymnosperms
D.
Algae
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Solution
Pteridophytes are the first group of plants that possess true leaves, stems, and roots.
Correct Answer:
B
— Pteridophytes
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Q. In which group of plants do you find the presence of xylem and phloem? (2020)
A.
Algae
B.
Mosses
C.
Ferns
D.
All of the above
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Solution
Ferns are the first group of plants that possess both xylem and phloem, which are essential for transport.
Correct Answer:
C
— Ferns
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Q. In which group of plants do you find true roots, stems, and leaves? (2020)
A.
Bryophytes
B.
Pteridophytes
C.
Gymnosperms
D.
All of the above
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Solution
Gymnosperms and pteridophytes both have true roots, stems, and leaves, while bryophytes do not.
Correct Answer:
D
— All of the above
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Q. In which kingdom would you classify mushrooms? (2022)
A.
Animalia
B.
Plantae
C.
Fungi
D.
Protista
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Solution
Mushrooms are classified in the kingdom Fungi, which includes all fungi, including yeasts and molds.
Correct Answer:
C
— Fungi
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Q. In which of the following conditions does the entropy of a system increase? (2022)
A.
When a gas is compressed
B.
When a solid melts
C.
When a liquid freezes
D.
When a gas is cooled
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Solution
The entropy of a system increases when a solid melts into a liquid, as the disorder of the system increases.
Correct Answer:
B
— When a solid melts
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Q. In which of the following does external fertilization occur? (2019)
A.
Frogs
B.
Humans
C.
Birds
D.
Reptiles
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Solution
Frogs typically exhibit external fertilization, where eggs and sperm are released into the water.
Correct Answer:
A
— Frogs
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Q. In which of the following organisms does binary fission occur? (2019)
A.
Yeast
B.
Amoeba
C.
Hydra
D.
Starfish
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Solution
Binary fission is a form of asexual reproduction commonly seen in unicellular organisms like Amoeba.
Correct Answer:
B
— Amoeba
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Q. In which of the following organisms does external fertilization occur? (2021)
A.
Frog
B.
Human
C.
Dog
D.
Cat
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Solution
Frogs exhibit external fertilization where eggs and sperm are released into the water.
Correct Answer:
A
— Frog
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