Some Chemical Reactions MCQs with Answers

Consider the given reaction: N₂ + 3H₂ → 2NH₃. If 56 g of N₂ reacts with 12 g of H₂ and produces 51 g of NH₃, what is the theoretical yield (TY) of NH₃ and the percentage yield (PY) of the reaction? (Molar mass of N₂ = 28 g/mol, H₂ = 2 g/mol and NH₃ = 17 g/mol)

• A.TY = 68 g and PY = 75%
• B.TY = 68 g and PY = 80%
• C.TY = 51 g and PY = 100%
• D.TY = 34 g and PY = 75%

Which of the following cannot undergo Aldol condensation reaction?

• A.Acetaldehyde
• B.Formaldehyde
• C.Benzaldehyde
• D.Both B and C

The resulting solution is neither acidic nor basic; it is neutral. This process is called?

• A.Neutralization
• B.Hydrolysis
• C.Precipitation
• D.Oxidation

In the process of burning a candle, the wax reacts with oxygen to produce ?

• A.CO₂, water, and energy
• B.CO₂ and hydrogen only
• C.Oxygen, water, and light
• D.Carbon monoxide and water only

The rate of a reaction is defined as?

• A.Δconcentration × Δtime
• B.Δconcentration + Δtime
• C.Δtime / Δconcentration
• D.Δconcentration / Δtime

Phenolphthalein is an indicator used to indicate the point of neutralisation reaction. It gives pink colour in alkalies and in an acid.

• A.Blue
• B.Red
• C.Yellow
• D.Colourless

Scientist Friedel and Crafts performed which type of reaction?

• A.Alkylation
• B.Hydrogenation
• C.Polymerization
• D.Oxidation

When fused PbBr2 is electrolyzed?

• A.Lead is deposited at the cathode
• B.Bromine is deposited at the cathode
• C.Lead is deposited at the anode
• D.No reaction takes place

Burning of wood is a change.

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

The combustion product of hydrocarbons are _?

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