Chemistry (General Concepts) MCQs with Answers

What is the oxidation number of an element in its free state?

• A.Zero
• B.One
• C.Depends on the element
• D.All of these

NH3 and BF3 combine readily because of the formation of _?

• A.Covalent bond
• B.Ionic bond
• C.Dative bond
• D.Hydrogen bond

Ionic radius in period from left to right ?

• A.Increases
• B.Decreases
• C.Remains constant
• D.First increases then decreases

Which law states that mass can neither be created nor destroyed?

• A.Law of Conservation of Mass
• B.Law of Conservation of Energy
• C.Law of Definite Proportions
• D.Law of Multiple Proportions

Which one of the following DO NOT have tendency to form hydrogen bonding?

• A.Water
• B.Hydrocarbon
• C.Ammonia
• D.Hydrogen fluoride

Number of molecules in 0.5 moles of CO₂ is?

• A.3.011 × 10²³
• B.6.022 × 10²³
• C.1.505 × 10²³
• D.12.044 × 10²³

Oxidation number of 'Mn' in KMnO₄ is _?

• A.+6
• B.+5
• C.+7
• D.+4

Solution is a mixture of ?

• A.Solute and Solvent
• B.Solid and Liquid
• C.Acid and Base
• D.Element and Compound

Name of ketone functional group is?

• A.Hydroxyl
• B.Carbonyl
• C.Carboxyl
• D.Amino

A water soluble base is known as ?

• A.Acid
• B.Salt
• C.Alkali
• D.Oxide