Q. In nuclear fission, the mass of the products is less than the mass of the reactants. What is this mass difference converted into? (2019)
A.
Kinetic energy
B.
Potential energy
C.
Binding energy
D.
Radiation
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Solution
The mass difference in nuclear fission is converted into kinetic energy of the fission fragments, according to Einstein's equation E=mc².
Correct Answer:
A
— Kinetic energy
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Q. In nuclear fission, what is released as a result of the reaction? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
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Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer:
A
— Energy and neutrons
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Q. In nuclear fission, what is released? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
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Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer:
A
— Energy and neutrons
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Q. In nuclear reactions, what is conserved? (2022)
A.
Mass only
B.
Charge only
C.
Mass and charge
D.
Energy only
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Solution
In nuclear reactions, both mass and charge are conserved, which is a fundamental principle of physics.
Correct Answer:
C
— Mass and charge
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Q. In plants, which structure is primarily responsible for asexual reproduction? (2023)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
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Solution
Stems, particularly in the form of runners or tubers, are primarily responsible for asexual reproduction in many plants.
Correct Answer:
C
— Stems
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Q. In plants, which structure is responsible for sexual reproduction? (2021)
A.
Roots
B.
Leaves
C.
Flowers
D.
Stems
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Solution
Flowers are the reproductive structures in plants that facilitate sexual reproduction.
Correct Answer:
C
— Flowers
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Q. In the complex ion [Fe(CN)6]3-, what is the oxidation state of iron? (2023)
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Solution
In [Fe(CN)6]3-, the CN- ligand has a charge of -1 and there are six CN- ligands. Therefore, the total negative charge is -6. To balance the -6 charge with the overall -3 charge of the complex, the oxidation state of iron must be +3.
Correct Answer:
C
— +3
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Q. In the context of adsorption, what does the term 'selectivity' refer to? (2022)
A.
The ability to adsorb multiple gases
B.
The preference for one gas over another
C.
The rate of adsorption
D.
The temperature dependence of adsorption
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Solution
Selectivity in adsorption refers to the preference of an adsorbent for one gas over another, which can be crucial in separation processes.
Correct Answer:
B
— The preference for one gas over another
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Q. In the context of atomic structure, what does the term 'isotope' refer to? (2021)
A.
Atoms with the same number of protons but different neutrons
B.
Atoms with different numbers of protons
C.
Atoms with the same mass number
D.
Atoms that are chemically identical
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Solution
Isotopes are defined as atoms that have the same number of protons but different numbers of neutrons.
Correct Answer:
A
— Atoms with the same number of protons but different neutrons
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Q. In the context of atomic structure, what does the term 'quantum leap' refer to? (2022)
A.
Movement of electrons in a circular path
B.
Transition of an electron between energy levels
C.
Emission of light
D.
Absorption of energy
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Solution
A 'quantum leap' refers to the transition of an electron between discrete energy levels in an atom.
Correct Answer:
B
— Transition of an electron between energy levels
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Q. In the context of measurements, what does precision refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
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Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer:
B
— Consistency of repeated measurements
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Q. In the context of surface chemistry, what does the term 'adsorption' refer to? (2022)
A.
The process of a substance being taken up by a liquid
B.
The process of a substance adhering to a surface
C.
The process of a substance dissolving in a solvent
D.
The process of a substance being absorbed into a solid
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Solution
Adsorption refers to the process where molecules adhere to the surface of a solid or liquid, forming a film.
Correct Answer:
B
— The process of a substance adhering to a surface
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Q. In the context of surface chemistry, what does the term 'desorption' mean? (2023)
A.
The process of adsorption
B.
The release of adsorbed molecules from a surface
C.
The absorption of a gas into a liquid
D.
The formation of a solid from a gas
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Solution
Desorption refers to the process where adsorbed molecules are released from the surface back into the gas or liquid phase.
Correct Answer:
B
— The release of adsorbed molecules from a surface
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Q. In the context of surface chemistry, what does the term 'desorption' refer to? (2022)
A.
The process of adsorption
B.
The release of adsorbate from the surface
C.
The formation of a new layer
D.
The increase in surface area
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Solution
Desorption refers to the process by which an adsorbate is released from the surface of the adsorbent.
Correct Answer:
B
— The release of adsorbate from the surface
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Q. In the context of surface chemistry, what does the term 'surface area' refer to? (2020)
A.
Total area of the solid
B.
Area available for adsorption
C.
Area of the bulk material
D.
Area of the gas
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Solution
In surface chemistry, 'surface area' refers to the area available for adsorption, which is crucial for determining the adsorption capacity.
Correct Answer:
B
— Area available for adsorption
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Q. In the electrochemical cell, what occurs at the anode? (2022)
A.
Reduction
B.
Oxidation
C.
Neutralization
D.
Precipitation
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Solution
At the anode of an electrochemical cell, oxidation occurs, which involves the loss of electrons.
Correct Answer:
B
— Oxidation
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Q. In the electrochemical cell, which electrode is the site of reduction? (2023)
A.
Anode
B.
Cathode
C.
Salt bridge
D.
Electrolyte
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Solution
In an electrochemical cell, the cathode is the electrode where reduction occurs.
Correct Answer:
B
— Cathode
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Q. In the electrochemical series, which element is the best reducing agent? (2022)
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Solution
Li is the best reducing agent among the given alkali metals due to its low ionization energy.
Correct Answer:
A
— Li
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Q. In the electrochemical series, which element is the strongest oxidizing agent? (2023)
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Solution
Fluorine (F2) is the strongest oxidizing agent in the electrochemical series due to its high electronegativity and tendency to gain electrons.
Correct Answer:
B
— F2
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Q. In the electrochemical series, which of the following has the highest reduction potential? (2022)
A.
Li+
B.
Na+
C.
K+
D.
F+
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Solution
Fluorine (F+) has the highest reduction potential in the electrochemical series, indicating it is a strong oxidizing agent.
Correct Answer:
D
— F+
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Q. In the expansion of (2x + 3)^4, what is the coefficient of x? (2020)
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Solution
The coefficient of x is given by 4C1 * (2)^1 * (3)^3 = 4 * 2 * 27 = 216.
Correct Answer:
B
— 36
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Q. In the expansion of (2x + 3)^4, what is the coefficient of x^0?
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Solution
The coefficient of x^0 is given by 4C4 * (2x)^0 * (3)^4 = 1 * 81 = 81.
Correct Answer:
A
— 81
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Q. In the expansion of (2x + 5)^3, what is the coefficient of x?
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Solution
The coefficient of x is given by 3C1 * (2)^1 * (5)^2 = 3 * 2 * 25 = 150.
Correct Answer:
B
— 45
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Q. In the expansion of (2x - 5)^5, what is the coefficient of x^2? (2021)
A.
-300
B.
-600
C.
600
D.
300
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Solution
The coefficient of x^2 is C(5,2) * (2)^2 * (-5)^3 = 10 * 4 * (-125) = -5000.
Correct Answer:
A
— -300
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Q. In the expansion of (2x - 5)^5, what is the coefficient of x^3? (2021)
A.
150
B.
300
C.
450
D.
600
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Solution
The coefficient of x^3 is C(5,3) * (2)^3 * (-5)^2 = 10 * 8 * 25 = 2000.
Correct Answer:
C
— 450
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Q. In the expansion of (2x - 5)^6, what is the coefficient of x^2? (2021)
A.
-150
B.
-300
C.
300
D.
150
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Solution
The coefficient of x^2 is C(6,2) * (2)^2 * (-5)^4 = 15 * 4 * 625 = -37500.
Correct Answer:
A
— -150
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Q. In the expansion of (2x - 5)^6, what is the coefficient of x^3? (2020)
A.
-600
B.
-720
C.
720
D.
600
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Solution
The coefficient of x^3 is C(6,3)(2)^3(-5)^3 = 20 * 8 * -125 = -20000.
Correct Answer:
B
— -720
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Q. In the expansion of (3 + 2x)^4, what is the coefficient of x^2? (2023)
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Solution
The coefficient of x^2 is C(4,2) * (3)^2 * (2)^2 = 6 * 9 * 4 = 216.
Correct Answer:
B
— 48
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Q. In the expansion of (3x - 2)^6, what is the coefficient of x^4? (2022)
A.
540
B.
810
C.
729
D.
486
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Solution
The coefficient of x^4 is given by 6C4 * (3)^4 * (-2)^2 = 15 * 81 * 4 = 4860.
Correct Answer:
A
— 540
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Q. In the expansion of (3x - 4)^4, what is the coefficient of x^2? (2023)
A.
-144
B.
-216
C.
216
D.
144
Show solution
Solution
The coefficient of x^2 is C(4,2)(3)^2(-4)^2 = 6 * 9 * 16 = -864.
Correct Answer:
B
— -216
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