Physical Pharmaceutics
Topic : Chemical Kinetics
1️⃣ What is not true about Chemical kinetics / Chemical reaction ?
A. It involves study of rate of mechanical process
B. Rate of reaction can be understood by studying time course of changes in concentration
C. Chemical reaction may be faster in solution dosage form than in suspension
D. None
2️⃣ Application of chemical kinetics in pharmacy involve ____
A. Drug stability
B.Dissolution
C. Drug release
D. All of the above
3️⃣ Number which is equal to the number of molecules or atoms that must collide simultaneously to give the products is known as _
A. Order of reaction
B. Molecularity
C. Stoichiometric reaction
D. None
4️⃣ What is not true about Molecularity ?
A. Stoichiometric equation is essential to decide molecularity of reaction
B. It is determined by postulating the mechanism for reaction
C. It must be bigger/higher number
D. Can’t be a fraction or zero
5️⃣ What is true about order of reaction ?
A. It is established with respect to each reactant
B. Can verified by plotting log concentration of reactant on x-axis & time on y-axis
C. When graph is plotted & If straight line is observed then the order will be “first” with respect to the reactant
D. In order of reaction , it is not possible for the order to assume fractional or zero values
6️⃣ t1/2 = a/2Ko is equation to find out half life of __
A. 1st order reaction
B. Zero order reaction
C. 2nd order reaction
D. None
7️⃣ Shelf life of 1st order reaction can be calculated by ___
A. t90 = 0.1a / Ko
B. t90 = Ko / 0.1a
C. t90 = 2.303 / k1 × log × Co / 0.9Co
D. t90 = 2.3030 / k1 × log × 0.9Co / Co
8️⃣ Which method is used to determine order of reaction ?
A. Graphic method
B. Substitution method
C. Half life method
D. All of the above
–1 –1
9️⃣ mol •( lit )• (time). Is unit of___
A. Zero order reaction
B. 1st order reaction
C. 2nd order reaction
D. None
???? If the Rate law of reaction is
rate = k [ A ] [ B ]
Then , the order of reaction is__
A. 1st order
B. 2nd order
C. 3rd order
D. None
Answers
1. A ( It involves study of rate of mechanical process )
2. D ( All of the above )
3. B ( Molecularity )
4. C ( It must be bigger / higher number )
5. A ( It is established with respect to each reactant )
6. B ( Zero order reaction )
7. C ( t90 = 2.3030 / k1 × log × Co / 0.9Co )
8. D ( All of the above )
9. A ( Zero order reaction )
10. B ( 2nd order )
