Chemistry (General Concepts) MCQs with Answers

The bond which is formed by the linear (head on) overlap is called ?

• A.Sigma bond
• B.Pi bond
• C.Hydrogen bond
• D.Ionic bond

Vertical columns in the periodic table are called _?

• A.Periods
• B.Rows
• C.Groups
• D.Blocks

The number of moles of NO₂ which contains 16 g of oxygen is?

• A.0.25
• B.0.50
• C.1.00
• D.0.75

A change in physical appearance or state of a substance is called ?

• A.Chemical Change
• B.Nuclear Change
• C.Physical Change
• D.Biological Change

A chemical change is called a _?

• A.Biological Reaction
• B.Physical Reaction
• C.Nuclear Reaction
• D.Chemical Reaction

Which solution contains more water?

• A.1.0 M
• B.0.75 M
• C.0.50 M
• D.0.25 M

The enthalpy change during the dissolution of one mole of gaseous ions in water to produce an infinitely dilute solution is known as?

• A.Enthalpy of formation
• B.Enthalpy of solution
• C.Enthalpy of atomization
• D.Enthalpy of hydration

Water is present in all living systems as universal solvent because of?

• A.Its high boiling point
• B.Its polar nature
• C.Its low density
• D.Its transparent appearance

The number of atoms of reactants is _ equal to number of atoms of products in a balanced chemical equation.

• A.Always
• B.Sometimes
• C.Never
• D.Rarely

Which condition must be true for a property to be classified as a chemical property?

• A.It changes the identity of the substance when observed.
• B.It can be observed without changing the substance's composition.
• C.It depends only on the physical state of the substance.
• D.It remains unchanged regardless of any chemical reaction.