JEE Main
Q. Which of the following is the correct order of acidity for the given compounds?
A.
Phenol > Ethanol > Water
B.
Ethanol > Water > Phenol
C.
Water > Phenol > Ethanol
D.
Phenol > Water > Ethanol
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Solution
Phenol is more acidic than ethanol and water due to the resonance stabilization of the phenoxide ion.
Correct Answer: A — Phenol > Ethanol > Water
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Q. Which of the following is the correct order of basicity for the given amines?
A.
RNH2 > R2NH > R3N
B.
R3N > R2NH > RNH2
C.
R2NH > R3N > RNH2
D.
RNH2 > R3N > R2NH
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Solution
The basicity of amines decreases with increasing alkyl substitution due to steric hindrance and electron-donating effects.
Correct Answer: A — RNH2 > R2NH > R3N
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Q. Which of the following is the correct representation of 0.00045 in scientific notation?
A.
4.5 × 10^-4
B.
4.5 × 10^-3
C.
45 × 10^-5
D.
45 × 10^-4
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Solution
0.00045 can be expressed in scientific notation as 4.5 × 10^-4.
Correct Answer: A — 4.5 × 10^-4
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Q. Which of the following is the correct representation of 0.0004500 in scientific notation?
A.
4.500 x 10^-4
B.
4.5 x 10^-4
C.
4.5000 x 10^-4
D.
4.5 x 10^-5
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Solution
In scientific notation, all non-zero digits and any trailing zeros after the decimal point are significant. Therefore, 0.0004500 is expressed as 4.500 x 10^-4.
Correct Answer: A — 4.500 x 10^-4
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Q. Which of the following is the correct representation of the speed of light?
A.
3.00 × 10^8 m/s
B.
3.00 × 10^6 m/s
C.
3.00 × 10^10 m/s
D.
3.00 × 10^9 m/s
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Solution
The speed of light in vacuum is approximately 3.00 × 10^8 m/s.
Correct Answer: A — 3.00 × 10^8 m/s
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Q. Which of the following is the correct structure for 2,3-dimethyl-2-butanol?
A.
CH3C(CH3)(OH)C(CH3)CH3
B.
CH3C(CH3)C(OH)CH2CH3
C.
CH3C(OH)(CH3)C(CH3)CH3
D.
CH3C(CH3)C(CH3)CH2OH
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Solution
The correct structure has the hydroxyl group on the second carbon with two methyl groups on the same carbon.
Correct Answer: A — CH3C(CH3)(OH)C(CH3)CH3
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Q. Which of the following is the correct structure for 2-methylpropane?
A.
CH3-CH(CH3)-CH2-CH3
B.
CH3-CH2-CH(CH3)-CH3
C.
CH3-CH(CH3)-CH(CH3)-CH3
D.
CH3-CH2-CH2-CH(CH3)
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Solution
2-methylpropane has a branched structure with a methyl group on the second carbon.
Correct Answer: B — CH3-CH2-CH(CH3)-CH3
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Q. Which of the following is the correct unit for measuring area?
A.
Square meter
B.
Cubic meter
C.
Liter
D.
Joule
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Solution
The correct unit for measuring area is square meter.
Correct Answer: A — Square meter
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Q. Which of the following is the correct unit for measuring electric charge?
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
The SI unit for electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. Which of the following is the correct unit for measuring electric current?
A.
Volt
B.
Ohm
C.
Ampere
D.
Watt
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Solution
The SI unit for measuring electric current is the Ampere.
Correct Answer: C — Ampere
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Q. Which of the following is the correct unit for measuring energy?
A.
Joule
B.
Newton
C.
Watt
D.
Pascal
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Solution
The correct unit for measuring energy is Joule (J).
Correct Answer: A — Joule
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Q. Which of the following is the correct unit for measuring the amount of substance?
A.
Liter
B.
Gram
C.
Mole
D.
Cubic meter
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Solution
The mole is the SI unit for measuring the amount of substance.
Correct Answer: C — Mole
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Q. Which of the following is the correct unit for molality?
A.
mol/L
B.
mol/kg
C.
mol/mL
D.
mol/1000g
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Solution
Molality is defined as moles of solute per kilogram of solvent, hence the unit is mol/kg.
Correct Answer: B — mol/kg
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Q. Which of the following is the correct unit for molarity?
A.
mol/L
B.
mol/kg
C.
g/L
D.
g/mol
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Solution
Molarity is defined as moles of solute per liter of solution, hence the unit is mol/L.
Correct Answer: A — mol/L
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Q. Which of the following is the equation of a hyperbola with transverse axis along the x-axis?
A.
x^2/a^2 - y^2/b^2 = 1
B.
y^2/a^2 - x^2/b^2 = 1
C.
x^2/b^2 - y^2/a^2 = 1
D.
y^2/b^2 - x^2/a^2 = 1
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Solution
The equation of a hyperbola with transverse axis along the x-axis is x^2/a^2 - y^2/b^2 = 1.
Correct Answer: A — x^2/a^2 - y^2/b^2 = 1
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Q. Which of the following is the equation of an ellipse with foci at (0, ±c) and vertices at (0, ±a)?
A.
x^2/a^2 + y^2/b^2 = 1
B.
y^2/a^2 + x^2/b^2 = 1
C.
x^2/b^2 + y^2/a^2 = 1
D.
y^2/b^2 + x^2/a^2 = 1
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Solution
The equation of an ellipse with foci at (0, ±c) and vertices at (0, ±a) is y^2/a^2 + x^2/b^2 = 1.
Correct Answer: A — x^2/a^2 + y^2/b^2 = 1
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Q. Which of the following is the functional group of aldehydes?
A.
-CHO
B.
-CO-
C.
-C=O
D.
-OH
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Solution
Aldehydes contain the functional group -CHO, which is characterized by a carbonyl group (C=O) bonded to a hydrogen atom.
Correct Answer: A — -CHO
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Q. Which of the following is the functional group of carboxylic acids?
A.
-OH
B.
-COOH
C.
-CHO
D.
-C=O
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Solution
Carboxylic acids contain the -COOH functional group.
Correct Answer: B — -COOH
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Q. Which of the following is the functional group present in alcohols?
A.
-OH
B.
-COOH
C.
-NH2
D.
-CHO
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Solution
Alcohols contain the hydroxyl group (-OH) as their functional group.
Correct Answer: A — -OH
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Q. Which of the following is the general formula for alkenes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_n
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Solution
The general formula for alkenes is C_nH_(2n), where n is the number of carbon atoms.
Correct Answer: A — C_nH_(2n)
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Q. Which of the following is the general formula for alkynes?
A.
C_nH_(2n+2)
B.
C_nH_(2n)
C.
C_nH_(2n-2)
D.
C_nH_(2n-1)
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Solution
The general formula for alkynes is C_nH_(2n-2), where n is the number of carbon atoms.
Correct Answer: C — C_nH_(2n-2)
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Q. Which of the following is the heaviest alkali metal?
A.
Lithium
B.
Sodium
C.
Potassium
D.
Cesium
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Solution
Cesium (Cs) is the heaviest alkali metal.
Correct Answer: D — Cesium
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Q. Which of the following is the molecular formula for butane?
A.
C3H8
B.
C4H10
C.
C5H12
D.
C6H14
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Solution
Butane has the molecular formula C4H10.
Correct Answer: B — C4H10
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Q. Which of the following is the most electronegative element in the p-block?
A.
Fluorine
B.
Chlorine
C.
Oxygen
D.
Nitrogen
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Solution
Fluorine is the most electronegative element in the p-block.
Correct Answer: A — Fluorine
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Q. Which of the following is the output of the expression NOT (A AND B) when A = 1 and B = 1?
A.
0
B.
1
C.
2
D.
Undefined
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Solution
First, evaluate A AND B which is 1 AND 1 = 1. Then NOT 1 = 0.
Correct Answer: A — 0
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Q. Which of the following is the range of the function f(x) = x^2 - 4?
A.
(-∞, -4]
B.
[-4, ∞)
C.
(-4, ∞)
D.
[0, ∞)
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Solution
The minimum value of f(x) is -4 when x=0, so the range is [-4, ∞).
Correct Answer: B — [-4, ∞)
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Q. Which of the following is the range of the function f(x) = x^2?
A.
All real numbers
B.
All positive real numbers
C.
All non-negative real numbers
D.
All integers
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Solution
The function f(x) = x^2 is non-negative for all real x, hence the range is all non-negative real numbers.
Correct Answer: C — All non-negative real numbers
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Q. Which of the following is the range of the function f(x) = |x - 1|?
A.
(-∞, 1)
B.
[0, ∞)
C.
(-1, 1)
D.
[1, ∞)
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Solution
The minimum value of |x - 1| is 0 when x = 1, so the range is [0, ∞).
Correct Answer: B — [0, ∞)
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Q. Which of the following is the simplest alkane?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Methane (CH4) is the simplest alkane, consisting of one carbon atom.
Correct Answer: A — Methane
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Q. Which of the following is the simplest alkyne?
A.
Ethylene
B.
Acetylene
C.
Propylene
D.
Butyne
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Solution
Acetylene (C2H2) is the simplest alkyne.
Correct Answer: B — Acetylene
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