Some Chemical Reactions MCQs with Answers

A reaction is first order with respect to A and third order with respect to B, the rate equation is:

• A.Rate = K[A][B]³
• B.Rate = K[A]³[B]
• C.Rate = K[A][B]
• D.Rate = K[A]³[B]³

Which of the following is true about an exothermic reaction?

• A.Requires a catalyst to proceed
• B.Absorbs heat from surroundings
• C.No energy change occurs
• D.Releases heat to surroundings

A reaction which never goes to completion is known as reversible reaction. Reversible reaction is represented by ?

• A.Single arrow (→)
• B.Double arrow (⇌)
• C.Triple arrow (→→→)
• D.None of these

In a chemical reaction, the catalyst _?

• A.Does not affect the speed of reaction
• B.Decreases the speed of reaction
• C.Increases the speed of reaction
• D.Stops the reaction completely

Dilute acids react with many metals to give gas.

• A.Oxygen
• B.Hydrogen
• C.Nitrogen
• D.Carbon dioxide

Exothermic reaction includes _?

• A.Combustion of methane
• B.Photosynthesis
• C.Melting of ice
• D.Evaporation of water

Oxidation is a chemical reaction involving the ?

• A.Gain of Electrons
• B.Loss of Electrons
• C.Gain of Protons
• D.Loss of Protons

The principle that states that if a stress is applied to a system at equilibrium, the system will nullify the effect of stress as far as possible is?

• A.Le-Chatelier's Principle
• B.Pauli Exclusion Principle
• C.Heisenberg's Uncertainty Principle
• D.Aufbau Principle

The reaction between hydrochloric acid and sodium hydroxide to form sodium chloride and water is _?

• A.Double displacement reaction
• B.Single displacement reaction
• C.Combination reaction
• D.Decomposition reaction

Acetamides are formed by the reaction of carboxylic acids with _?

• A.NH₃
• B.NaOH
• C.HCl
• D.H₂SO₄