Chemistry
Q. What is the equilibrium constant (Kc) for the reaction: A + B ⇌ C + D? (2022)
A.
Kc = [C][D]/[A][B]
B.
Kc = [A][B]/[C][D]
C.
Kc = [C][D][A][B]
D.
Kc = [A][B][C][D]
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Solution
The equilibrium constant Kc is defined as the ratio of the concentrations of the products to the reactants, each raised to the power of their coefficients in the balanced equation.
Correct Answer: A — Kc = [C][D]/[A][B]
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Q. What is the equilibrium constant (Kc) for the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)? (2022) 2022
A.
1.0 × 10^-5
B.
1.0 × 10^-2
C.
1.0 × 10^2
D.
1.0 × 10^5
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Solution
The equilibrium constant Kc for the formation of ammonia from nitrogen and hydrogen is typically around 1.0 × 10^5 at standard conditions.
Correct Answer: D — 1.0 × 10^5
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Q. What is the expected major product when 2-bromobutane undergoes elimination reaction?
A.
But-1-ene
B.
But-2-ene
C.
But-3-ene
D.
Butane
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Solution
The major product of the elimination reaction of 2-bromobutane is But-2-ene due to the formation of the more stable alkene.
Correct Answer: B — But-2-ene
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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 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 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 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 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 functional group of alcohols? (2020)
A.
-OH
B.
-COOH
C.
-CHO
D.
-NH2
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Solution
The functional group of alcohols is the hydroxyl group (-OH).
Correct Answer: A — -OH
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Q. What is the functional group of aldehydes?
A.
-OH
B.
-CHO
C.
-C=O
D.
-COOH
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Solution
The functional group of aldehydes is -CHO.
Correct Answer: B — -CHO
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Q. What is the functional group of phenols? (2019) 2019
A.
-OH
B.
-COOH
C.
-CHO
D.
-NH2
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Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic ring.
Correct Answer: A — -OH
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Q. What is the functional group present in alcohols? (2023) 2023
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 phenols? (2021)
A.
-OH
B.
-COOH
C.
-CHO
D.
-NH2
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Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.
Correct Answer: A — -OH
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Q. What is the functional group present in phenols? (2021) 2021
A.
-OH
B.
-COOH
C.
-CHO
D.
-NH2
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Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.
Correct Answer: A — -OH
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Q. What is the general formula for secondary amines? (2021) 2021
A.
RNH2
B.
R2NH
C.
R3N
D.
RNH
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Solution
The general formula for secondary amines is R2NH, where R represents an alkyl or aryl group.
Correct Answer: B — R2NH
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Q. What is the geometry of a molecule with two bonding pairs and no lone pairs on the central atom? (2023)
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Bent
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Solution
The geometry is linear when there are two bonding pairs and no lone pairs on the central atom.
Correct Answer: A — Linear
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Q. What is the geometry of the complex ion [Ag(NH3)2]+? (2019) 2019
A.
Tetrahedral
B.
Square planar
C.
Octahedral
D.
Linear
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Solution
The complex [Ag(NH3)2]+ has a linear geometry due to the presence of two ligands around the silver ion.
Correct Answer: D — Linear
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Q. What is the group number of Alkali metals in the periodic table? (2023)
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Solution
Alkali metals are located in group 1 of the periodic table.
Correct Answer: A — 1
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Q. What is the group number of Halogens in the periodic table? (2021)
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Solution
Halogens are located in group 17 of the periodic table.
Correct Answer: B — 17
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Q. What is the hybridization of the central atom in [Ni(CO)4]? (2022)
A.
sp
B.
sp2
C.
sp3
D.
d2sp3
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Solution
In [Ni(CO)4], the nickel atom undergoes sp3 hybridization to accommodate four CO ligands.
Correct Answer: C — sp3
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Q. What is the hybridization of the central metal ion in [Cr(NH3)6]3+? (2020) 2020
A.
sp
B.
sp2
C.
d2sp3
D.
dsp2
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Solution
In [Cr(NH3)6]3+, the hybridization is d2sp3 due to the octahedral arrangement of six ligands.
Correct Answer: C — d2sp3
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Q. What is the IUPAC name of CH3CH2Cl?
A.
Chloroethane
B.
Ethyl chloride
C.
Ethane chloride
D.
Chloromethane
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Solution
The IUPAC name of CH3CH2Cl is Chloroethane, as it is a two-carbon alkane with a chlorine substituent.
Correct Answer: A — Chloroethane
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Q. What is the IUPAC name of CH3CH2OH? (2021) 2021
A.
Ethanol
B.
Methanol
C.
Propanol
D.
Butanol
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Solution
The compound CH3CH2OH is an alcohol with two carbon atoms, which is named Ethanol.
Correct Answer: A — Ethanol
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Q. What is the IUPAC name of CH3CHO? (2023) 2023
A.
Acetaldehyde
B.
Ethanal
C.
Ethyl aldehyde
D.
Methyl ketone
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Solution
The IUPAC name of CH3CHO is ethanal, which is the simplest aldehyde.
Correct Answer: B — Ethanal
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Q. What is the IUPAC name of the compound CH3CH2NH2? (2021)
A.
Ethylamine
B.
Dimethylamine
C.
Propylamine
D.
Methylamine
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Solution
The IUPAC name of CH3CH2NH2 is Ethylamine, as it consists of an ethyl group attached to an amine.
Correct Answer: A — Ethylamine
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Q. What is the Ksp expression for the salt AgCl? (2023)
A.
[Ag+][Cl-]
B.
[AgCl]
C.
[Ag+][Cl-]^2
D.
[AgCl]^2
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Solution
The solubility product constant (Ksp) for AgCl is expressed as Ksp = [Ag+][Cl-], where [Ag+] and [Cl-] are the molar concentrations of the ions in a saturated solution.
Correct Answer: A — [Ag+][Cl-]
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