All Free Chemistry MCQs with Answers

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Explanation: The monomers for the compound "Terylene" or Polyester are Ethylene glycol and Terephthalic acid. The reaction is as follows:

• A. Polyvinyl chloride
• B. Nylon
• C. Carbohydrate
• D. Polyester

Explanation: An 'addition polymer' is a polymer which consists of monomers, that add on to each other or combine without the formation of a secondary…

• A. Primary alcohols
• B. Secondary alcohols
• C. Organic acids
• D. Inorganic acids

Explanation: Consider any 1° alcohol. For simplicity consider it to be open-chain alcohol.

• A. Acetaldehyde.
• B. Formaldehyde.
• C. None of these.
• D. Both A and B.

Explanation: Chloral is produced by chlorinating acetaldehyde or ethanol in an acidic solution by gradually increasing the temperature from 0 °C to 90…

• A. Initiator
• B. Promoter
• C. Catalyst
• D. Reactant

Explanation: Explanation:In the conversion of ethylene into acetaldehyde, cupric chloride acts as promoter.

• A. Formaldehyde
• B. Acetaldehyde
• C. Calcium acetate
• D. Sodium acetate

Explanation: A is incorrect as formaldehyde is a product of calcium salt of formic acid.B is correct as Dry distillation of a mixture of the above…

• A. Ketone
• B. Aldehyde
• C. Formic Acid
• D. Ether

Explanation: Primary alcohols are oxidised to the corresponding aldehydes which are then oxidised to carboxylic acids.

• A. Carboxylic Acid
• B. Acid Amide
• C. Cyanohydride
• D. Formaldehyde

Explanation: A is correct as hydrolysis of a cyano group results in the formation of a carboxylic acid (fact)B is incorrect as acid amide is not a…

• A. Sulphur.
• B. Phosphorous
• C. Argon
• D. Sugar.

Explanation: London forces are significant in noble gases like argon. Noble gases are known for their weak intermolecular interactions, mainly London…

• A. Alcohol-ether.
• B. Nicotine-water.
• C. Benzene-water.
• D. Both A and B.

Explanation: The nicotine-water system has an LCST of 61 °C, and also a UCST of 210 °C at pressures high enough for liquid water to exist at that…

• A. Dipole-dipole forces
• B. Dipole-induced dipole forces
• C. London dispersion forces
• D. Hydrogen bonding

Explanation: A is incorrect because dipole-dipole forces only occur in polar molecules.B is incorrect as dipole-induced dipole forces are present…

• A. Atoms of helium in gaseous state at high temperature
• B. Molecules of water
• C. Molecules of NH3
• D. Molecules of HCl gas

Explanation: Option A is correct because helium atoms are non-polar and only exhibit London dispersion forces.

• A. boiling point
• B. heat of vaporization
• C. heat of sublimation
• D. moles

Explanation: The number of moles of a substance does not depend on the strength of dipole-dipole forces.

• A. Osmotic pressure
• B. Freezing point
• C. Diffusion
• D. Melting

Explanation: The correct option is D, melting. Melting is not a property of liquids but a process that occurs when a solid is heated to become a liquid.

• A. Principal Quantum Number
• B. Spin Quantum Number
• C. Magnetic Quantum Number
• D. Azimuthal Quantum Number

Explanation: A is incorrect as The principal quantum number, n, describes the energy of an electron and the most probable distance of the electron from…

• A. Dilatometric
• B. Refractometric
• C. Optical rotation
• D. Electrical conductivity

Explanation: A is incorrect as a dilatometer is a scientific instrument that measures volume changes caused by a physical or chemical process.B is…

• A. Li
• B. Be
• C. Na
• D. K

Explanation: Lithium is harder than other alkali metals. The melting and boiling point is higher than other alkali metals.

• A. H+
• B. H2−2
• C. H
• D. H−

Explanation: Explanation:The correct answer is H+ because when hydrogen loses an electron, it becomes a positively charged ion called a hydrogen ion or…

• A. Rubidium
• B. Potassium
• C. Sodium
• D. Lithium

Explanation: Explanation:Lithium carbide is the only alkali metal carbide formed via direct reaction.

• A. Li2CO3
• B. Mg2CO3
• C. K2CO3
• D. Na2CO3

Explanation: A is correct as Lithium carbonate is not stable to heat. Hence, it decomposes at a lower temperature.B is incorrect as Mg2CO3 is stable…