Some Chemical Reactions MCQs with Answers

Which one of the following is not a sign of physical change?

• A.Change in shape
• B.Change in state
• C.A release of gas
• D.Change in size

The unit of Kc for reaction N2 + O2 ⇌ 2NO is?

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

When ethylene ozonide is treated with Zn-dust we get _?

• A.Methanal
• B.Ethanal
• C.Propanone
• D.Ethanoic acid

pH of the solution after dissolving little amount of sodium acetate is ?

• A.7.0
• B.8.0
• C.5.0
• D.2.0

When H⁺ ion concentration of a solution is 1 × 10⁻⁸, the pH of that solution will be _?

• A.6
• B.7
• C.8
• D.9

The process in which an acid is mixed with a base, resulting in the formation of salt and water, is called ?

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

Which reactant controls the amount of product formed in a chemical reaction?

• A.Excess Reactant
• B.Limiting Reactant
• C.Catalyst
• D.Activated Complex

In a reversible reaction, the catalyst reduces the time to reach equilibrium by?

• A.Increasing the rate of both forward and reverse reactions
• B.Increasing the rate of forward reaction only
• C.Decreasing the rate of reverse reaction only
• D.Shifting the equilibrium towards the products

Which of the following has greatest energy in the reaction?

• A.Reactants
• B.Products
• C.Transition state
• D.Intermediate

Acids are used to make aqua regia, which of the following noble metals can be dissolved in it?

• A.Gold and Platinum
• B.Silver and Copper
• C.Iron and Zinc
• D.All of these