Major Competitive Exams
Q. Which of the following is the correct structure for 2-butyne?
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A.
CH3-C≡C-CH3
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B.
CH3-CH≡C-CH3
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C.
CH3-C=C-CH3
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D.
C≡C-CH2-CH3
Solution
2-butyne has the structure CH3-CH≡C-CH3, with the triple bond between the second and third carbon.
Correct Answer: B — CH3-CH≡C-CH3
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Q. Which of the following is the correct structure for 2-methylpropane?
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A.
CH3-CH(CH3)-CH2-CH3
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B.
CH3-CH2-CH(CH3)-CH3
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C.
CH3-CH(CH3)-CH(CH3)-CH3
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D.
CH3-CH2-CH2-CH(CH3)
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?
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A.
Square meter
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B.
Cubic meter
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C.
Liter
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D.
Joule
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?
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A.
Coulomb
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B.
Ampere
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C.
Volt
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D.
Ohm
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?
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A.
Volt
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B.
Ohm
-
C.
Ampere
-
D.
Watt
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
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B.
Newton
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C.
Watt
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D.
Pascal
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?
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A.
Liter
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B.
Gram
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C.
Mole
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D.
Cubic meter
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?
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A.
mol/L
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B.
mol/kg
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C.
mol/mL
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D.
mol/1000g
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?
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A.
mol/L
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B.
mol/kg
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C.
g/L
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D.
g/mol
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?
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A.
x^2/a^2 - y^2/b^2 = 1
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B.
y^2/a^2 - x^2/b^2 = 1
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C.
x^2/b^2 - y^2/a^2 = 1
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D.
y^2/b^2 - x^2/a^2 = 1
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)?
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A.
x^2/a^2 + y^2/b^2 = 1
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B.
y^2/a^2 + x^2/b^2 = 1
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C.
x^2/b^2 + y^2/a^2 = 1
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D.
y^2/b^2 + x^2/a^2 = 1
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?
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A.
-CHO
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B.
-CO-
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C.
-C=O
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D.
-OH
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?
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A.
-OH
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B.
-COOH
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C.
-CHO
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D.
-C=O
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?
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A.
-OH
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B.
-COOH
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C.
-NH2
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D.
-CHO
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?
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A.
C_nH_(2n)
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B.
C_nH_(2n+2)
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C.
C_nH_(2n-2)
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D.
C_nH_n
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?
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A.
C_nH_(2n+2)
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B.
C_nH_(2n)
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C.
C_nH_(2n-2)
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D.
C_nH_(2n-1)
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?
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A.
Lithium
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B.
Sodium
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C.
Potassium
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D.
Cesium
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?
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A.
C3H8
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B.
C4H10
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C.
C5H12
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D.
C6H14
Solution
Butane has the molecular formula C4H10.
Correct Answer: B — C4H10
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Q. Which of the following is the most acidic among the following oxides? (2019)
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A.
SO2
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B.
P2O5
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C.
CO2
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D.
N2O5
Solution
P2O5 is the most acidic oxide among the given options, as it forms phosphoric acid in water.
Correct Answer: B — P2O5
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Q. Which of the following is the most electronegative element in the p-block?
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A.
Fluorine
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B.
Chlorine
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C.
Oxygen
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D.
Nitrogen
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?
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A.
0
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B.
1
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C.
2
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D.
Undefined
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?
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A.
(-∞, -4]
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B.
[-4, ∞)
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C.
(-4, ∞)
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D.
[0, ∞)
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?
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A.
All real numbers
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B.
All positive real numbers
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C.
All non-negative real numbers
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D.
All integers
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|?
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A.
(-∞, 1)
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B.
[0, ∞)
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C.
(-1, 1)
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D.
[1, ∞)
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?
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A.
Methane
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B.
Ethane
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C.
Propane
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D.
Butane
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?
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A.
Ethylene
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B.
Acetylene
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C.
Propylene
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D.
Butyne
Solution
Acetylene (C2H2) is the simplest alkyne.
Correct Answer: B — Acetylene
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Q. Which of the following is the simplest ketone?
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A.
Ethanal
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B.
Propanal
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C.
Butan-2-one
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D.
Acetone
Solution
Acetone (propan-2-one) is the simplest ketone, with the formula (CH3)2CO.
Correct Answer: D — Acetone
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Q. Which of the following is the solution set for the inequality x + 2 > 1?
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A.
x > -1
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B.
x < -1
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C.
x > 1
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D.
x < 1
Solution
x + 2 > 1 => x > -1.
Correct Answer: A — x > -1
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Q. Which of the following is the solution set for the inequality x + 2 > 7?
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A.
x > 5
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B.
x < 5
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C.
x > 9
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D.
x < 9
Solution
x + 2 > 7 => x > 5.
Correct Answer: A — x > 5
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Q. Which of the following is the solution set for the inequality x + 5 > 2?
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A.
x > -3
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B.
x < -3
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C.
x > 3
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D.
x < 3
Solution
x + 5 > 2 => x > -3.
Correct Answer: A — x > -3
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