Q. What is the formula of the compound formed when magnesium reacts with oxygen?
A.
MgO
B.
Mg2O3
C.
MgO2
D.
Mg3O2
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Solution
Magnesium reacts with oxygen to form magnesium oxide, which has the formula MgO.
Correct Answer: A — MgO
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Q. What is the freezing point depression constant (Kf) for water?
A.
1.86 °C kg/mol
B.
0.52 °C kg/mol
C.
2.00 °C kg/mol
D.
3.72 °C kg/mol
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Solution
The freezing point depression constant (Kf) for water is 1.86 °C kg/mol.
Correct Answer: A — 1.86 °C kg/mol
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Q. What is the freezing point depression of a solution containing 2 moles of KCl in 1 kg of water?
A.
-3.72 °C
B.
-1.86 °C
C.
-2.52 °C
D.
-4.0 °C
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Solution
Freezing point depression = i * Kf * m = 3 * 1.86 * 2 = 11.16 °C, so the freezing point is lowered by 3.72 °C.
Correct Answer: A — -3.72 °C
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Q. What is the freezing point depression of a solution containing 2 moles of KCl in 1 kg of water? (Kf for water = 1.86 °C kg/mol)
A.
3.72 °C
B.
1.86 °C
C.
2.0 °C
D.
5.58 °C
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Solution
Freezing point depression = i * Kf * m = 3 * 1.86 * 2 = 11.16 °C.
Correct Answer: A — 3.72 °C
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Q. What is the freezing point depression of a solution containing 2 moles of NaCl in 1 kg of water? (Kf for water = 1.86 °C kg/mol)
A.
3.72 °C
B.
1.86 °C
C.
2.72 °C
D.
5.72 °C
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Solution
Freezing point depression = i * Kf * m = 3 * 1.86 * 2 = 11.16 °C.
Correct Answer: A — 3.72 °C
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Q. What is the freezing point depression of a solution directly proportional to?
A.
The molar mass of the solute
B.
The number of solute particles
C.
The volume of the solvent
D.
The temperature of the solvent
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Solution
Freezing point depression is directly proportional to the number of solute particles in the solution.
Correct Answer: B — The number of solute particles
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Q. What is the freezing point depression of a solution if 0.5 mol of a non-volatile solute is dissolved in 1 kg of water? (Kf for water = 1.86 °C kg/mol)
A.
0.93 °C
B.
1.86 °C
C.
3.72 °C
D.
0.5 °C
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Solution
Freezing point depression = Kf * molality = 1.86 * 0.5 = 0.93 °C.
Correct Answer: A — 0.93 °C
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Q. What is the freezing point of a solution containing 0.3 mol of glucose in 1 kg of water? (K_f for water = 1.86 °C kg/mol)
A.
-0.558 °C
B.
-0.558 K
C.
-1.86 °C
D.
-1.86 K
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Solution
Freezing point depression = K_f * m = 1.86 * 0.3 = 0.558 °C; Freezing point = 0 - 0.558 = -0.558 °C
Correct Answer: A — -0.558 °C
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Q. What is the function of hemoglobin in the body?
A.
To catalyze reactions
B.
To transport oxygen
C.
To provide structural support
D.
To store energy
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Solution
Hemoglobin is a protein that functions to transport oxygen from the lungs to tissues throughout the body.
Correct Answer: B — To transport oxygen
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Q. What is the functional group of ketones?
A.
-CHO
B.
-CO-
C.
-OH
D.
-NH2
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Solution
The functional group of ketones is -CO-, which is a carbonyl group between two carbon atoms.
Correct Answer: B — -CO-
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Q. What is the functional group present in alcohols?
A.
Aldehyde
B.
Ketone
C.
Hydroxyl
D.
Carboxylic acid
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Solution
Alcohols contain a hydroxyl (-OH) functional group.
Correct Answer: C — Hydroxyl
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Q. What is the functional group present in carboxylic acids?
A.
Hydroxyl group
B.
Carbonyl group
C.
Carboxyl group
D.
Amino group
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Solution
Carboxylic acids contain the carboxyl group (-COOH), which is the defining feature of this class of compounds.
Correct Answer: C — Carboxyl group
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Q. What is the functional group present in ketones?
A.
-CHO
B.
-CO-
C.
-OH
D.
-C=O
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Solution
Ketones contain the functional group -CO- (carbonyl group) between two carbon atoms.
Correct Answer: B — -CO-
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Q. What is the general formula for alkanes?
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 alkanes is C_nH_(2n+2).
Correct Answer: B — C_nH_(2n+2)
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Q. What is the general formula for alkenes?
A.
C_nH_(2n)
B.
C_nH_(2n+2)
C.
C_nH_(2n-2)
D.
C_nH_(2n+1)
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Solution
Alkenes are unsaturated hydrocarbons with the general formula CnH2n.
Correct Answer: A — C_nH_(2n)
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Q. What 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. What is the general formula for carbohydrates?
A.
C_n(H2O)_n
B.
C_nH_nO_n
C.
C_nH_2nO_n
D.
C_nH_2O_n
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Solution
The general formula for carbohydrates is C_n(H2O)_n, indicating that they are hydrates of carbon.
Correct Answer: A — C_n(H2O)_n
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Q. What is the general formula for carboxylic acids?
A.
C_nH_2nO_2
B.
C_nH_2n+1COOH
C.
C_nH_2nO
D.
C_nH_2n+2O
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Solution
The general formula for carboxylic acids is C_nH_2nO_2.
Correct Answer: A — C_nH_2nO_2
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Q. What is the general formula for cycloalkanes?
A.
CnH2n
B.
CnH2n+2
C.
CnH2n-2
D.
CnH2n-4
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Solution
The general formula for cycloalkanes is CnH2n.
Correct Answer: A — CnH2n
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Q. What is the general formula for ketones?
A.
CnH2nO
B.
CnH2n+2O
C.
CnH2n-2O
D.
CnH2nO2
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Solution
The general formula for ketones is CnH2nO, where n is the number of carbon atoms.
Correct Answer: A — CnH2nO
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Q. What is the general trend in the melting points of alkali metals as you move down the group?
A.
They increase
B.
They decrease
C.
They remain constant
D.
They fluctuate
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Solution
The melting points of alkali metals generally decrease as you move down the group due to the increase in atomic size and decrease in metallic bonding strength.
Correct Answer: B — They decrease
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Q. What is the general trend of ionization energy across a period?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Increases then decreases
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Solution
Ionization energy generally increases across a period due to increasing nuclear charge.
Correct Answer: A — Increases
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Q. What is the geometry of a molecule with sp3d hybridization?
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Trigonal bipyramidal
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Solution
Molecules with sp3d hybridization have a trigonal bipyramidal geometry.
Correct Answer: D — Trigonal bipyramidal
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Q. What is the geometry of the complex ion [Ag(NH3)2]+?
A.
Linear
B.
Tetrahedral
C.
Octahedral
D.
Square planar
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Solution
The geometry of [Ag(NH3)2]+ is linear due to the presence of two ligands.
Correct Answer: A — Linear
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Q. What is the geometry of the complex ion [Cu(NH3)4]2+?
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Trigonal bipyramidal
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Solution
The geometry of the complex ion [Cu(NH3)4]2+ is square planar.
Correct Answer: B — Square planar
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Q. What is the geometry of the complex ion [Ni(CN)4]2-?
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Trigonal bipyramidal
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Solution
[Ni(CN)4]2- has a square planar geometry due to the presence of 4 ligands around the nickel ion.
Correct Answer: B — Square planar
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Q. What is the geometry of the complex [Ag(NH3)2]+?
A.
Linear
B.
Tetrahedral
C.
Square Planar
D.
Octahedral
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Solution
The geometry of [Ag(NH3)2]+ is linear due to the coordination number of 2.
Correct Answer: A — Linear
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Q. What is the geometry of [Ag(NH3)2]+?
A.
Linear
B.
Tetrahedral
C.
Octahedral
D.
Square planar
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Solution
The geometry of [Ag(NH3)2]+ is linear due to the presence of two ligands.
Correct Answer: A — Linear
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Q. What is the Gibbs Free Energy change (ΔG) at equilibrium?
A.
ΔG < 0
B.
ΔG = 0
C.
ΔG > 0
D.
ΔG = ΔH - TΔS
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Solution
At equilibrium, the Gibbs Free Energy change (ΔG) is zero, indicating that the system is at its lowest energy state.
Correct Answer: B — ΔG = 0
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Q. What is the Gibbs free energy change for a spontaneous process?
A.
Positive
B.
Negative
C.
Zero
D.
Undefined
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Solution
For a spontaneous process, the Gibbs free energy change is negative.
Correct Answer: B — Negative
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