All Free Chemistry MCQs with Answers

• A. Ethanol
• B. Phenol
• C. Ethanal
• D. Propanone

Explanation: If bromine water is added to a solution of phenol in water, the bromine water/aqueous bromine is decolarized and a white precipitate is…

• A. Thiol
• B. Alcohol
• C. Phenol
• D. Ether

Explanation: Thiol (R-SH) typically contains the most acidic proton. This is because the sulfur atom in thiol is less electronegative than oxygen in…

• A. hv
• B. ½ mv^2
• C. Mgh
• D. Mc^2

Explanation: The emission or absorption of energy by an atom is represented by: ∆E = hυ Where '∆E' is the energy difference between the initial and…

• A. Polystyrene
• B. Bakelite
• C. Nylon
• D. Teflon

Explanation: The correct answer is Option D:Teflon. The trade name of tetralluoroethylene polymer is PTFE, which is commonly known as Teflon.

• A. Polystoene
• B. Backlite
• C. Nylone
• D. Teflone

Explanation: Tetrafluoroethylene is commonly known as Teflon.

• A. Substitution reaction
• B. Addition polymerization
• C. Condensation polymerization
• D. Condensation reaction

Explanation: The formation of PVC (Polyvinyl Chloride) from vinyl chloride is an example of addition polymerization.

• A. NaOH
• B. NaHCO3
• C. Na2CO3
• D. Na2CO3. 2H2O

Explanation: Mercerization is an industrial process involving sodium hydroxide for cotton yarns or fabrics to increase the luster and dyeability.It is…

• A. High molecular weight compounds from monomers
• B. Low molecular weight compounds from monomers
• C. Intermediate molecular weight compound from monomers
• D. High molecular weight compounds from polymers

Explanation: High molecular weight compounds from monomers: This is the correct option.

• A. Painta
• B. Venshes
• C. Water proofing fabrics
• D. All of the above

Explanation: Silicon is used in Paints as it improves adherence, waterproofing and resistance to chemicals.

• A. It is used in large scale production of cable insulator
• B. It is a copolymer
• C. It is a homopolymer
• D. It is used in the manufacturing of pipes

Explanation: b) It is a copolymer:This option states that polyvinyl chloride is a copolymer. This statement is not correct.

• A. PVC
• B. Terylene
• C. Nylon
• D. Teflon

Explanation: Nylon is a synthetic polymer that contains nitrogen in its chemical structure.

• A. H2O
• B. HCl
• C. NH3
• D. No molecules are eliminated

Explanation: In polymer chemistry, an additional polymer is a polymer that forms by simple linking of monomers without the co-generation of other…

• A. Primary alcohol
• B. Secondary alcohol
• C. Acetone
• D. Carboxylic acid

Explanation: When a Grignard reagent reacts with carbon dioxide, the reaction leads to the formation of a carboxylate salt as an intermediate.

• A. Hydroxyl group
• B. A hydroxyl group and carboxyl group
• C. A carboxyl group
• D. A carboxyl and aldehyde group

Explanation: A carboxyl group: This option is correct. Carboxylic acids are organic compounds that contain a carboxyl group (−COOH).

• A. 136 PM, 123 PM
• B. 123 PM and 136 PM
• C. 136 PM, 136 PM
• D. 123 PM and 123 PM

Explanation: The correct answer is 123 PM for the C = O bond and 136 PM for the C-O bond.

• A. CH3COOH +NH3
• B. CH3COOH +NH4Cl
• C. CH3COCl +NH3
• D. CH3CONH2

Explanation: Students should remember that nitriles react with aqueous HCl in a hydrolysis reaction to form the corresponding carboxylic acid and salt…

• A. Hydrogen bonding
• B. Dipole-dipole interaction
• C. London forces
• D. Covalent bounding

Explanation: London forces are caused by movement of electrons leading to instantaneous dipoles.

• A. Gases only
• B. Liquids only
• C. Solids only
• D. All of the above

Explanation: The London dispersion force is the weakest intermolecular force. The London dispersion force is a temporary attractive force that results…

• A. Decrease in surface tension of water
• B. Viscosity of water
• C. High boiling point of water
• D. Polarity of water

Explanation: Polarity of water: Soap molecules have polar and nonpolar regions, allowing them to interact with both water and oily substances…

• A. London forces are present in non-polar molecules.
• B. London forces are present in polar molecules.
• C. London forces are created between an instantaneous dipole and an induced dipole.
• D. All of the above.

Explanation: London dispersion forces are a type of van der Waals force and are the weakest intermolecular force.