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Molecularity of a reaction
- a)Cannot be less than 2
- b)Can be zero
- c)Is always a natural number
- d)Can have a fractional values
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is alw...
Molecularity is defined as the number of molecules, atoms, or radicals that must collide simultaneously in order for the reaction to take place. It is always a natural number and cannot be negative.
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Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is alw...
Molecularity of a reaction:
The molecularity of a reaction refers to the number of molecules or atoms that participate in a single step of a chemical reaction. It determines the order of the reaction and helps in understanding the reaction mechanism.
Options:
- Option a) Cannot be less than 2: This statement is not correct. The molecularity of a reaction can be 0, 1, 2, or even higher.
- Option b) Can be zero: This statement is correct. The molecularity of a reaction can be zero for certain reactions where only one molecule is involved, such as radioactive decay or unimolecular reactions.
- Option c) Is always a natural number: This statement is correct. The molecularity of a reaction is always a natural number, which means it is a positive integer (including zero).
- Option d) Can have fractional values: This statement is not correct. The molecularity of a reaction cannot have fractional values since it represents the number of molecules or atoms involved, which cannot be fractional.
Explanation:
The molecularity of a reaction is determined by the number of reactant molecules or atoms that collide together to form the products. It is often equal to the sum of the stoichiometric coefficients of the reactants in the balanced chemical equation.
Based on the reaction mechanism, reactions can be classified as:
Unimolecular reactions:
In unimolecular reactions, only one molecule is involved in the rate-determining step. These reactions have a molecularity of 1. For example:
A → Products
Bimolecular reactions:
In bimolecular reactions, two molecules collide to form the products. These reactions have a molecularity of 2. For example:
A + B → Products
Termolecular reactions:
In termolecular reactions, three molecules collide simultaneously to form the products. These reactions have a molecularity of 3. However, termolecular reactions are relatively rare due to the low probability of three molecules colliding simultaneously.
A + B + C → Products
Zero-order reactions:
In some reactions, the rate is independent of the concentration of one or more reactants. These reactions have a molecularity of 0. For example:
A → Products
Therefore, the correct answer is option c) Is always a natural number. The molecularity of a reaction is always a positive integer (including zero) and can be 0, 1, 2, or even higher depending on the reaction mechanism.
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Community Answer
Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is alw...
Molecularity is the number of atoms, ions or molecules that must collide with one another simultaneously so as to result into a chemical reaction. So, it will always be a whole number, as half or 3/4 of ion or atom can't collide. Hence the correct answer is option C.
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Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer?.
Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Molecularity of a reactiona)Cannot be less than 2b)Can be zeroc)Is always a natural numberd)Can have a fractional valuesCorrect answer is option 'C'. Can you explain this answer?.
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