Chemistry (General Concepts) MCQs with Answers

Which of the following is not a characteristic of a chemical change?

• A.Formation of new substances
• B.Change in chemical composition
• C.Temporary change
• D.Energy is absorbed or released

The major reason that phenol is a better Bronsted acid than cyclohexanol is _?

• A.Phenol is able to stabilize the anion formed in the reaction by resonance
• B.Phenol has a higher molecular weight than cyclohexanol
• C.Cyclohexanol is more soluble in water than phenol
• D.The hydroxyl group in phenol is attached to an sp³ hybridized carbon

Stoichiometry calculations can only be carried out when?

• A.The chemical equation is balanced
• B.The reactants are in excess
• C.The reaction is exothermic
• D.The products are pure

Which phenomenon occurs when a molecule exhibits an unequal distribution of alkyl groups on either side of a functional group?

• A.Tautomerism
• B.Metamerism
• C.Isomerism
• D.Polymerism

The least stable carbanion is _?

• A.CH₃⁻
• B.C₂H₅⁻
• C.(CH₃)₂CH⁻
• D.(CH₃)₃C⁻

The calculated magnetic moment of 5.92 BM corresponds to unpaired electrons of _?

• A.4
• B.3
• C.6
• D.5

Cyclic ethers that have two ether groups are called ?

• A.Epoxides
• B.Crown ethers
• C.Lactones
• D.Acetals

An ionic compound is most likely to be formed when ?

• A.The ionization energy of A is low but electron affinity of B is high
• B.The ionization energy of both A and B is high
• C.The electron affinity of both A and B is low
• D.The ionization energy of A is high but electron affinity of B is low

A physical change does not involve change in _?

• A.Shape
• B.Size
• C.Mass
• D.State

I-Butene and II-Butene are showing which type of isomerism?

• A.Position isomerism
• B.Functional group isomerism
• C.Chain isomerism
• D.Geometrical isomerism