Q. What is the expected product of the reaction of 1-chlorobutane with zinc in dry ether?
A.
Butane
B.
Butyne
C.
Butene
D.
No reaction
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Solution
The reaction of 1-chlorobutane with zinc in dry ether leads to the formation of Butane via Wurtz reaction.
Correct Answer:
A
— Butane
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Q. What is the expected product when 1-chlorobutane reacts with aqueous NaOH?
A.
Butanol
B.
Butene
C.
No reaction
D.
Butyric acid
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Solution
The expected product is Butanol due to nucleophilic substitution with hydroxide ion.
Correct Answer:
A
— Butanol
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Q. What is the Faraday's constant value?
A.
96485 C/mol
B.
96500 C/mol
C.
96500 A·s/mol
D.
96480 C/mol
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Solution
Faraday's constant is approximately 96485 C/mol.
Correct Answer:
A
— 96485 C/mol
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Q. What is the Faraday's constant?
A.
96485 C/mol
B.
96500 C/mol
C.
96500 J/mol
D.
96485 J/mol
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Solution
Faraday's constant is approximately 96485 C/mol.
Correct Answer:
A
— 96485 C/mol
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Q. What is the final concentration when 100 mL of 1 M NaCl is diluted to 500 mL? (2021)
A.
0.2 M
B.
0.5 M
C.
1 M
D.
2 M
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Solution
Using M1V1 = M2V2, (1 M)(0.1 L) = M2(0.5 L). M2 = 0.2 M.
Correct Answer:
B
— 0.5 M
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Q. What is the final temperature when 200 g of ice at 0°C is added to 100 g of water at 80°C? (Specific heat of water = 4.2 J/g°C) (2020)
A.
0°C
B.
20°C
C.
40°C
D.
80°C
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Solution
Using the principle of conservation of energy, the heat lost by water equals the heat gained by ice. Solving gives a final temperature of 20°C.
Correct Answer:
B
— 20°C
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Q. What is the final temperature when 200 g of ice at 0°C is added to 100 g of water at 80°C? (Assume no heat loss to the surroundings) (2023)
A.
0°C
B.
20°C
C.
40°C
D.
80°C
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Solution
Using heat balance: m_ice * L_f + m_water * c * (T_final - 80) = 0. Solving gives T_final = 20°C.
Correct Answer:
B
— 20°C
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Q. What is the final volume when 100 mL of a 3 M solution is diluted to a concentration of 1 M? (2022) 2022
A.
300 mL
B.
200 mL
C.
100 mL
D.
150 mL
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Solution
Using the dilution formula C1V1 = C2V2, we have 3 M * 100 mL = 1 M * V2. Thus, V2 = 300 mL.
Correct Answer:
A
— 300 mL
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Q. What is the force between two charges of +2μC and -3μC separated by 0.5m? (2022)
A.
0.24 N
B.
0.12 N
C.
0.48 N
D.
0.36 N
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Solution
Using Coulomb's law, F = k * |q1 * q2| / r^2 = (9 × 10^9) * (2 × 10^-6) * (3 × 10^-6) / (0.5)^2 = 0.24 N.
Correct Answer:
A
— 0.24 N
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Q. What is the force between two point charges of +2 µC and -3 µC separated by a distance of 0.5 m in vacuum?
A.
-24 N
B.
-12 N
C.
12 N
D.
24 N
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Solution
Using Coulomb's law, F = k * |q1 * q2| / r^2 = (9 × 10^9) * |2 × 10^-6 * -3 × 10^-6| / (0.5)^2 = -24 N.
Correct Answer:
A
— -24 N
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Q. What is the force experienced by a current-carrying conductor of length L in a magnetic field B at an angle θ? (2023)
A.
F = BIL
B.
F = BIL sin(θ)
C.
F = BIL cos(θ)
D.
F = BIL²
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Solution
The force on a current-carrying conductor in a magnetic field is given by F = BIL sin(θ), where θ is the angle between the conductor and the magnetic field.
Correct Answer:
B
— F = BIL sin(θ)
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Q. What is the force on a 2 m long conductor carrying a current of 5 A in a magnetic field of 0.3 T at an angle of 30° to the field? (2021)
A.
0.75 N
B.
1.5 N
C.
2.5 N
D.
3.0 N
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Solution
Using the formula F = BIL sin(θ), F = 0.3 * 2 * 5 * sin(30°) = 1.5 N.
Correct Answer:
B
— 1.5 N
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Q. What is the force on a charge moving in a magnetic field given by F = qvB sin(θ)? (2022)
A.
It is always zero
B.
It depends on the angle θ
C.
It is constant
D.
It is maximum when θ = 90°
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Solution
The force on a charge moving in a magnetic field is maximum when the angle θ between the velocity vector and the magnetic field is 90°, as sin(90°) = 1.
Correct Answer:
D
— It is maximum when θ = 90°
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Q. What is the force on a charge moving in a magnetic field given by the equation F = qvB sin(θ)? (2020)
A.
Charge times velocity
B.
Charge times magnetic field
C.
Charge times velocity times magnetic field times sine of angle
D.
Charge times sine of angle
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Solution
The force on a charge moving in a magnetic field is given by F = qvB sin(θ), where q is the charge, v is the velocity, B is the magnetic field strength, and θ is the angle between the velocity and the magnetic field.
Correct Answer:
C
— Charge times velocity times magnetic field times sine of angle
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Q. What is the formula for calculating the force of gravity between two masses? (2021)
A.
F = ma
B.
F = G(m1m2)/r²
C.
F = mv
D.
F = mgh
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Solution
The formula for gravitational force is F = G(m1m2)/r², where G is the gravitational constant.
Correct Answer:
B
— F = G(m1m2)/r²
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Q. What is the formula for calculating the number of moles? (2023) 2023
A.
Mass/Volume
B.
Mass/Molar Mass
C.
Volume/Mass
D.
Molar Mass/Volume
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Solution
The number of moles is calculated using the formula: Moles = Mass / Molar Mass.
Correct Answer:
B
— Mass/Molar Mass
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Q. What is the formula for calculating the total current in a parallel RLC circuit? (2023)
A.
I = V/R
B.
I = V/(1/R + 1/X)
C.
I = V/(R + X)
D.
I = V/R + V/X
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Solution
In a parallel RLC circuit, the total current is calculated using I = V/(1/R + 1/X), where X is the total reactance.
Correct Answer:
B
— I = V/(1/R + 1/X)
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Q. What is the formula for the average power consumed in an AC circuit with a phase angle φ? (2020)
A.
P = VI
B.
P = VI cos(φ)
C.
P = VI sin(φ)
D.
P = V²/R
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Solution
The average power P in an AC circuit is given by P = VI cos(φ), where φ is the phase angle.
Correct Answer:
B
— P = VI cos(φ)
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Q. What is the formula for the average power consumed in an AC circuit with a resistor? (2019)
A.
P = VI
B.
P = V²/R
C.
P = I²R
D.
All of the above
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Solution
The average power consumed in an AC circuit can be expressed as P = VI, P = V²/R, and P = I²R.
Correct Answer:
D
— All of the above
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Q. What is the formula for the complex formed between iron(III) and thiocyanate? (2021)
A.
[Fe(SCN)3]
B.
[Fe(SCN)2]
C.
[Fe(SCN)6]3+
D.
[Fe(SCN)4]2-
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Solution
The complex formed is [Fe(SCN)3] as iron(III) can bond with three thiocyanate ions.
Correct Answer:
A
— [Fe(SCN)3]
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Q. What is the formula for the resonant frequency of an RLC circuit? (2021)
A.
f = 1/(2π√(LC))
B.
f = R/(2πL)
C.
f = 1/(2πRC)
D.
f = 2π√(LC)
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Solution
The resonant frequency f of an RLC circuit is given by f = 1/(2π√(LC)).
Correct Answer:
A
— f = 1/(2π√(LC))
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Q. What is the formula for the total impedance in a parallel RLC circuit? (2023)
A.
1/Z = 1/Z1 + 1/Z2 + 1/Z3
B.
Z = R + jX
C.
Z = R
D.
.
X
.
Z = R + jωL - j/(ωC)
Show solution
Solution
The total impedance in a parallel circuit is given by 1/Z = 1/Z1 + 1/Z2 + 1/Z3.
Correct Answer:
A
— 1/Z = 1/Z1 + 1/Z2 + 1/Z3
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Q. What is the formula for the total impedance in a series RLC circuit? (2023)
A.
Z = R + j(XL - XC)
B.
Z = R + jXL + jXC
C.
Z = R + jωL
D.
Z = R + jωC
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Solution
The total impedance in a series RLC circuit is given by Z = R + j(XL - XC).
Correct Answer:
A
— Z = R + j(XL - XC)
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Q. What is the freezing point depression of a solution containing 1 mol of NaCl in 1 kg of water? (Kf for water = 1.86 °C kg/mol) (2023)
A.
1.86 °C
B.
3.72 °C
C.
2.00 °C
D.
0.93 °C
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Solution
Freezing point depression (ΔTf) = i * Kf * m. For NaCl, i = 2 (dissociates into Na+ and Cl-). m = 1 mol/kg. ΔTf = 2 * 1.86 °C kg/mol * 1 = 3.72 °C.
Correct Answer:
B
— 3.72 °C
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Q. What is the frequency of a pendulum that completes 30 oscillations in 60 seconds? (2017)
A.
0.5 Hz
B.
1 Hz
C.
2 Hz
D.
3 Hz
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Solution
Frequency f = number of oscillations / time = 30 / 60 = 0.5 Hz.
Correct Answer:
B
— 1 Hz
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Q. What is the frequency of a sound wave with a period of 0.01 seconds? (2014)
A.
100 Hz
B.
200 Hz
C.
50 Hz
D.
10 Hz
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Solution
Frequency = 1/Period = 1/0.01 s = 100 Hz.
Correct Answer:
A
— 100 Hz
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Q. What is the frequency of a tuning fork that vibrates 256 times in 2 seconds? (2019)
A.
128 Hz
B.
256 Hz
C.
512 Hz
D.
64 Hz
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Solution
Frequency (f) = Number of vibrations / Time = 256 / 2 = 128 Hz.
Correct Answer:
A
— 128 Hz
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Q. What is the frequency of a wave with a period of 0.01 s? (2020)
A.
100 Hz
B.
50 Hz
C.
200 Hz
D.
10 Hz
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Solution
Frequency f = 1/T = 1/0.01 s = 100 Hz.
Correct Answer:
A
— 100 Hz
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Q. What is the frequency of a wave with a period of 0.1 s? (2020)
A.
10 Hz
B.
5 Hz
C.
20 Hz
D.
15 Hz
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Solution
Frequency f = 1/T = 1/0.1 s = 10 Hz.
Correct Answer:
A
— 10 Hz
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Q. What is the frequency of a wave with a period of 0.2 seconds?
A.
5 Hz
B.
10 Hz
C.
20 Hz
D.
50 Hz
Show solution
Solution
Frequency (f) is the reciprocal of the period (T). Therefore, f = 1/T = 1/0.2 s = 5 Hz.
Correct Answer:
B
— 10 Hz
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