Some Chemical Reactions MCQs with Answers

The reagent commonly used for oxidation of alcohols is?

• A.KMnO₄
• B.NaOH
• C.HCl
• D.NaHCO₃

Actual yield will reach the ideal (theoretical) value if the % yield of the reaction is,

• A.50%
• B.75%
• C.0%
• D.100%

Esterification reaction is usually carried out in the presence of?

• A.NaCl
• B.NaOH
• C.HCl (dil.)
• D.H₂SO₄ (conc.)

In a chemical reaction, heat of formation is only _?

• A.Evolved
• B.Absorbed
• C.Evolved or absorbed
• D.Neither evolved nor absorbed

How does a fire extinguisher help to put out a fire?

• A.By cooling the fuel below its ignition temperature
• B.By increasing the surrounding humidity
• C.By removing the source of fuel
• D.By cutting oxygen supply

When vinegar is mixed with baking soda ?

• A.A nuclear change occurs
• B.A physical change occurs
• C.No change occurs
• D.A chemical change occurs

Which of the following have positive value for heat?

• A.Exothermic reactions
• B.Neutralization reactions
• C.Endothermic reactions
• D.Combustion reactions

What happened to reaction if activation energy is increased?

• A.Rate of reaction remains same
• B.Rate of reaction increases
• C.Rate of reaction decreases
• D.Reaction stops completely

A single compound breaks down to form two or more simpler substances. This type of reaction is called?

• A.Combination Reaction
• B.Neutralization Reaction
• C.Displacement Reaction
• D.Decomposition Reaction

An ester is prepared by ?

• A.Alcohol and amine
• B.Aldehyde and ketone
• C.Carboxylic acid and amine
• D.Carboxylic acid and alcohol