Visitors Online: 3389 | Thursday 28th May 2015
CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Chemical Kinetics
1 MARK QUESTION
- Define activation energy of a reaction
- Why is that instantaneous rate of reaction does not change when a part of the reacting solution is taken out?
- Under what conditions does the rate of reaction becomes equal to rate constant?
- Define rate of reaction.
- State two factors which affect the rate of a chemical reaction.
- Define order of reaction.
- Identify the reaction order if the unit of rate constant is per sec.
- Name one zero order reaction.
- How is rate constnt related tothe concentrations of reactants?
- Define half life of a reaction
2 MARKS QUESTION
- A first order reaction is 20% completed in 10 min. How much time does it take for 75% completion.
- Differentiate between reaction rate and reaction rate constant.
- What is meant by order and molecularity of a reaction. Distinguish between them.
- What are Pseudo unimolecular reaction. Give two examples.
- A first order reaction is 30% completen in 50 min. Calculate the value of rate constant.
3 MARKS QUESTION
- What are photochemical reactions. Give one example to illustrate the course of photochemical reaction.
- Defferentiate between rate of reactionand rate constant of a reaction.
Show that the time required for completion for three-fourth of a first order reaction is twice the time required for the completion of half reaction.
- 60% of a first order reaction was completed in 60 min. When was it half completed.
- For a first order reaction, it takes 5 min. for the initial concentration of 0.6 mol/litre to be come 0.4 mol/Litre How long will it take for the initial concentration to become 0.3 mol/Litre.
- In general it is observed that the rate of a chemical reaction doubles with every 10 degree rise in temperature. If this generalization hold for a reaction in the temperature range 295K to 305 K what would be the value of activation energy for this reaction [ R=8.314 J/K/mol]
- Atomic Structure and Chemical Bonding
- Solid State
- Chemical Kinetics
- P Block Elements
- D and F Block Elements
- Nuclear Chemistry
- Stereo Chemistry
- Organic Functional Group I
- Organic Functional Group II and III
- Surface Chemistry
- Chemistry In Every Day Life
- Practice Paper No.1
- Practice Paper No.2
- Practice Paper No.3
- Practice Paper No.4