Chemical Kinetics: Class 12 Chemistry Q&A
3 free answers on Chemical Kinetics (Chemistry) for Class 12 students, across CBSE, ICSE and State boards. Includes questions such as “What is the difference between order and molecularity?”, “what is zero order reaction?”
Question & Answer
Questions
- ChemistryClass 12CBSE
2N₂O₅(g) → 4NO₂(g) + O₂(g). Initial P = 50 mmHg; P at 30 min = 87.5 mmHg. Find P at 60 min.
Step-1: Let N₂O₅ decrease by 2p. Total pressure = 50 + 3p:50 + 3p = 87.5 ⇒ p = 12.5 mmHgP(N₂O₅) at 30 min = 50 − 2(12.5) = 25 mmHgStep-2: Rate constant (first order):k = (1/30) × ln(50/25) = ln(2)/30 = 0.02310 min⁻¹Step-3: P(N₂O₅) at 60 min (= two half-lives = 25% of initial):P(N₂O₅) at 60 min = 50/4 = 12.5 mmHgStep-4: Total pressure at 60 min:Decrease = 50 − 12.5 = 37.5
- ChemistryClass 12All
What is the difference between order and molecularity?
It seems like there might be a slight confusion in your question. "Order" and "molecularity" are terms used in different contexts, particularly in chemistry and kinetics. Let me clarify the differences between them: Order: In the context of chemical kinetics, the term "order" refers to the power to which the concentration of a reactant is raised in the rate equation. The order of a reaction with respect to a specific reactant is determined experimentally and may be an
- ChemistryClass 12All
what is zero order reaction?
A zero-order reaction is a type of chemical reaction in which the rate of reaction is independent of the concentration of one or more of the reactants. In a zero-order reaction, the rate of reaction remains constant over time, and it is not influenced by changes in the concentration of the reactants. The general form of a zero-order reaction can be expressed as follows: Rate = k Where: "Rate" is the rate of the reaction (the change in concentration of a reactan