All Free Chemistry MCQs with Answers
Every Chemistry question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
13,720 questions · page 642 of 686
- A. Hybridization
- B. Protonation
- C. Deprotonation
- D. Dissociation
Explanation: A is correct as geometry of complexes in dependent upon hybridizationHybridization is the idea that atomic orbitals fuse to form newly…
Correct answer: Hybridization- A. sp-s overlap
- B. sp3-sp3 overlap
- C. 2py-2py overlap
- D. sp-sp overlap
Explanation: A is incorrect as sp-s overlap isnt present in ethyne molecule.B is incorrect as sp3-sp3 overlap isnt present in ethyne molecule.C is…
Correct answer: sp-sp overlap- A. HCl
- B. HF
- C. HI
- D. HBr
Explanation: Due to the small size and high electronegativity of Fluorine, it does very strong Hydrogen Bonding in an HF molecule.
Correct answer: HF- A. Lower than
- B. Higher than
- C. Equal to
- D. Almost same as
Explanation: H2O have a greater boiling point than HF because H2O can form 4 hydrogen bond while HF has 2 hydrogen bond and to break all the hydrogen…
Correct answer: Lower than- A. Weaker than petrol
- B. Stronger than petrol
- C. Same as in petrol
- D. Negligible
Explanation: Melting and boiling points depend on the intermolecular strengths of a molecule, higher the boiling and melting point stronger the…
Correct answer: Stronger than petrol- A. I + IV
- B. II + IV
- C. III + IV + V
- D. I + II + III
Explanation: Hydrogen bonding is found between the hydrogen atom of one molecule (which is covalently bonded to an electronegative atom) and the…
Correct answer: III + IV + V- A. Ammonia
- B. Ethyl alcohol
- C. Carboxylic acids
- D. Hydrocarbon
Explanation: Hydrocarbons, which include alkanes, alkenes, and alkynes, do not form hydrogen bonds because they consist solely of carbon and hydrogen…
Correct answer: Hydrocarbon- A. 6 atm
- B. 4 atm
- C. 2 atm
- D. 1 atm
Explanation: Use the combined gas law.P₁V₁/T₁ = P₂V₂/T₂P₁ = initial pressure = 3 atmV₁ = initial volume = 100 m³T₁ = initial temperature= 27° C+273.15…
Correct answer: 2 atm- A. Dalton's Law
- B. Charles's Law
- C. Boyle's Law
- D. Graham's Law
Explanation: Explanation:Dalton's law states that the total pressure exerted by a mixture of non reacting gases is equal to the sum of their individual…
Correct answer: Dalton's Law- A. 8.314 Jmol-2K-1
- B. 1.38 Jmol-1 K-2
- C. 1.38 Jmol-1K-1
- D. 8.314 Jmol-1 K-1
Explanation: Explanation: The value of the universal gas constant R depends on the units of pressure, volume, and temperature used.
Correct answer: 8.314 Jmol-1 K-1- A. 67.8 x100 / 50
- B. 50 x 100 / 100
- C. 67.8 X 50/ 100
- D. 67.8 +50/ 100
Explanation: To find the partial pressure of H2, we need to calculate the pressure contributed by H2 gas based on its percentage in the mixture.
Correct answer: 67.8 X 50/ 100- A. qV=nRt
- B. pV=nRt
- C. gV=nRt
- D. yV=nRt
Explanation: PV=nRTP = Pressure of the gasV = Volume of the gasn = Number of moles of gasR = Universal gas constant (8.314 J/mol·K)T = Temperature in…
Correct answer: pV=nRt- A. -NH2
- B. -NH+3
- C. -COOH
- D. -COO-
Explanation: The correct answer is -COOH, which is the carboxylic acid functional group present in amino acids.
Correct answer: -COOH- A. Conductor
- B. Non - conductor
- C. Semiconductor
- D. None of these
Explanation: A non-conductor, also known as an insulator, is a material that does not allow electric current to flow through it easily.
Correct answer: Non - conductor- A. Sugar
- B. Iron
- C. Diamond
- D. Na
Explanation: Ions bound together by electrostatic attraction form ionic crystals. Their arrangement varies depending on the ions' sizes or the radius…
Correct answer: Na- A. Metamerism
- B. Functional group
- C. Chain
- D. Position
Explanation: CH3-O-CH3 exhibits functional group isomerism. The compounds having the same molecular formula but different functional groups are said to…
Correct answer: Functional group- A. 1-butene
- B. 1-hexene
- C. 1-bromo-2-chloropropene
- D. Propene
Explanation: Explanation:1-bromo-2-chloropropene has two different groups (bromo and chloro) attached to the double bond, allowing for the possibility…
Correct answer: 1-bromo-2-chloropropene- A. Cis-trans isomerism
- B. Chain isomerism
- C. Position isomerism
- D. Functional group isomerism
Explanation: Positional isomers are constitutional isomers that have the same carbon skeleton and the same functional groups but differ from each other…
Correct answer: Position isomerism- A. Option A: 1-butene
- B. Option B: 2-butene (trans)
- C. Option C: 2-butene (cis)
- D. Option D: Cyclohexane
Explanation: In the context of alkenes, cis-isomerism occurs when two identical or similar groups are on the same side of a double bond.
Correct answer: Option C: 2-butene (cis)- A. A
- B. B
- C. C
- D. D
Explanation: Isomers are those compounds that have diff structures but the same molecular formula, which is the case in A only, they form cis- trans…
Correct answer: A