Some Chemical Reactions MCQs with Answers

Which gas can turn lime water milky?

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

On warming with silver powder, chloroform is converted into _?

• A.Hexachloroethane
• B.Acetylene
• C.Carbon tetrachloride
• D.Methylene dichloride

The formation of activated complex in a reaction is _?

• A.Endothermic process
• B.Exothermic process
• C.Neither endothermic nor exothermic
• D.Both endothermic and exothermic

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

• A.Rate = k [A][B]
• B.Rate = k [A]²[B]
• C.Rate = k [A][B]²
• D.Rate = k [A]²[B]²

Which one of the following factors does not affect equilibrium?

• A.Temperature
• B.Pressure
• C.Catalyst
• D.Concentration

The use of potassium hydroxide produces a ?

• A.Hard soap
• B.Soft soap
• C.Detergent
• D.Shampoo

Rusting of iron is a chemical change because ?

• A.A new substance (iron oxide) is formed
• B.Iron loses its shine
• C.Iron becomes weaker
• D.The shape of iron changes

What is an example of a synthesis reaction?

• A.Hydrochloric acid reacting with sodium hydroxide to form salt and water
• B.Water breaking down into Hydrogen and Oxygen
• C.Sodium reacting with water to form sodium hydroxide and hydrogen
• D.Hydrogen and Oxygen combining to form water

Which gaseous hydride most readily decomposes into its elements on contact with a hot glass rod?

• A.Hydrogen fluoride
• B.Hydrogen chloride
• C.Hydrogen iodide
• D.Hydrogen bromide

As temperature increases, initially the rate of reaction will _?

• A.Increase
• B.Decrease
• C.Remain constant
• D.First decrease then increase