Some Chemical Reactions MCQs with Answers

A reaction in which heat energy is absorbed or taken into the system is called ?

• A.Exothermic reaction
• B.Adiabatic reaction
• C.Isothermic reaction
• D.Endothermic reaction

Past Paper MCQ

What type of change is the boiling of eggs considered to be?

• A.Physical change
• B.Reversible change
• C.Chemical change
• D.Temporary change

The breakdown of water using electric current is called?

• A.Electrolysis
• B.Hydrolysis
• C.Electrolytic decomposition
• D.Photolysis

A system attains equilibrium when ΔG° is _?

• A.Zero
• B.Positive
• C.Negative
• D.Infinite

Hydrochloric acid reacts with ammonia to produce ?

• A.Colorless gas
• B.Brown fumes
• C.Green fumes
• D.White fumes

The homolytic fission of C-H bond in an alkane results in

• A.Alkyl free radical
• B.Carbocation
• C.Carbanion
• D.Alkene

The oxidation of methane produces?

• A.Carbon dioxide and hydrogen
• B.Carbon monoxide and hydrogen
• C.Carbon and hydrogen
• D.Carbon dioxide and water

The blue color of Fehling solution is changed to red when warmed with an aldehyde due to formation of which of the following?

• A.Cu(OH)₂
• B.CuO
• C.CuSO₄
• D.Cu₂O

What will be the products of CaCO₃ + 2HCl →?

• A.CaO + HCl + CO
• B.CaO + Cl₂ + H₂O
• C.CaCl₂ + H₂ + CO₂
• D.CaCl₂ + H₂O + CO₂

When carboxylic acids are heated with alcohol in the presence of sulphuric acid, which of the following is formed?

• A.Aldehydes
• B.Ethers
• C.Ketones
• D.Esters