Some Chemical Reactions MCQs with Answers

Which is the repetitive bonding of small molecules to produce large molecules?

• A.Polymerization
• B.Condensation
• C.Hydrolysis
• D.Oxidation

When ethanol is taken and temperature is kept 170°C, on dehydration with concentrated H2SO4 it gives a molecule of _?

• A.Ethane
• B.Ethene
• C.Ethyne
• D.Methane

Thermal decomposition reactions are generally?

• A.Exothermic
• B.Endothermic
• C.Isothermic
• D.None of these

When calcium carbonate reacts with dilute hydrochloric acid, gas is produced.

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

Gun powder is a mixture of which three substances?

• A.Sulphur, charcoal, and saltpetre (nitre)
• B.Sulphur, carbon, and potassium chloride
• C.Phosphorus, charcoal, and saltpetre
• D.Sulphur, charcoal, and limestone

What is the unit for the equilibrium constant for the reaction 2H₂O → H₃O⁺ + OH⁻?

• A.mol dm⁻³
• B.mol² dm⁻⁶
• C.No unit
• D.dm³ mol⁻¹

Which of the following compound will react with 2,2-dimethyl propanoic acid to produce ester?

• A.Ethanol
• B.Ethanal
• C.Ethanoic acid
• D.Ethane

In the reaction PCl₃ + Cl₂ ⇌ PCl₅ + heat, what happens to the equilibrium if Cl₂ is removed?

• A.The reaction shifts to the left
• B.The reaction shifts to the right
• C.No change occurs
• D.The reaction stops completely

CH3MgBr reacts with CH3O to give?

• A.1° Alcohol
• B.2° Alcohol
• C.3° Alcohol
• D.No reaction

One carbon less than parent atom carboxylic acid is produced by hydrolysis of?

• A.Ketone
• B.Aldehyde
• C.Ester
• D.Alcohol