Class 10 chemistry MCQs with answers are provided here for chapter 1 Chemical Reactions and Equations. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 10 chemistry syllabus. Students who wish to do well in their CBSE board exams should study MCQ Questions for Class 10 Science with Answers PDF Free Download. Students can boost their board exam scores by practising chapter-by-chapter CBSE Class 10 Science Multiple Choice Questions with Answers.
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Class 10 Chemical Reactions and Equations MCQs
1. What is the rate of chemical reaction?
a) Chemical reaction rate is a chemical property
b) Chemical reaction rate is a physical property
c) Chemical reaction rate is an intensive property
d) Chemical reaction rate is an extensive property
Answer: c
Explanation: Chemical reaction rate depends on temperature and concentration. Hence, it is an intensive property.
2. The term “catalyst” refers to ___________
a) Can either increase or decrease the speed of a chemical reaction
b) Alters the value of equilibrium constant in a reversible chemical reaction
c) Increases the speed of a chemical reaction
d) Decreases the speed of a chemical reaction
Answer: a
Explanation: The term “catalyst” refers to a material that raises the rate of a reaction without consuming itself at the end of the process. Some catalysts, known as negative catalysts, slow down the rate of a reaction.
3. The reaction order is determined by
a) Power of any one of the reactant concentrations
b) Number of molecules of reactants taking part in the reaction
c) Sum of the powers of the concentrations of all the reactants
d) Concentration of intermediate species formed
Answer: c
Explanation: The power to which the concentration term in the rate equation is raised determines the order of a reaction with regard to a specific material. If the reaction involves more than one reactant molecule, the order of the reaction is equal to the sum of the powers of all reacting species’ concentrations in the rate expression.
4. The rate of homogeneous response is influenced by a number of factors.
a) Temperature only
b) Pressure only
c) Reactant Concentration only
d) Temperature, pressure and reactant concentration
Answer: d
Explanation: In the rate expression, the rate constant is a function of temperature. The number of collisions between reactant molecules reduces as pressure rises. This slows down the reaction time. The reaction rate is increased by increasing the initial concentration of the reactant. As a result, temperature and pressure conditions, as well as the initial concentration of reactant, determine the reaction rate.
5. A reaction’s rate cannot be expressed in terms of time.
a) Volume of reacting fluid
b) Volume of solid
c) Amount of product
d) Interfacial surface
Answer: c
Explanation: Based on unit interfacial area and unit volume of solid, the reaction rate can be represented in terms of unit volume of reacting fluid. The rate of reaction is unaffected by the amount of product generated.
6. The number of molecules engaged in an elementary reaction is referred to as ____
a) Molecularity
b) Order of reaction
c) Unimolecular reaction
d) Rate of reaction
Answer: a
Explanation: The number of molecules of the reactant involved in an elementary reaction is known as its molecularity. The sum of the powers of the concentrations of all the reactants determines the reaction’s order. Only one reactant is used in unimolecular reactions. The number of moles of the reactant component that vanish per unit volume per unit time is the rate of a reaction.
7. Only liquid pressure is measured with which of the following instruments?
a) Differential Manometer
b) Manometer
c) Piezometer
d) None of the mentioned
Answer: c
Explanation: A piezometer is a pressure measuring instrument that is solely used to detect liquid pressure.
8. Which of the following statements concerning basic reactions is correct?
a) They occur in multiple steps
b) They are complex in nature
c) Order of elementary reaction is an integer
d) All first order reactions are elementary
Answer: c
Explanation: An elementary reaction’s order can never accept fractional values. In a single step, elementary reactions take place. There are two types of first-order reactions: elementary and non-elementary.
9. A state function is which of the following?
a) Entropy
b) Heat
c) Work
d) None of the mentioned
Answer: a
Explanation: Entropy is a state function since it is independent of the process’s course.
10. What is the conservation of Bernoulli’s Equation?
a) Pressure
b) Energy
c) Mass
d) Momentum
Answer: b
Explanation: Bernoulli’s equation is a modified version of the energy conservation equation.
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