Chemistry – Class 12 – Question Bank – Chemical Kinetics and f & d Block Elements - For Board Examination
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Course
Chemistry
Institution
Chemistry
Chemistry – Class 12 – Question Bank – Chemical Kinetics and f & d Block Elements - For Board Examination - 1 Page - Very Useful for Students Studying in Class 12 and for Teachers teaching 12
Q.Derive an expression for integrated rate equation of
(i) First order reaction, (ii) Zero order reaction.
Q.Show that half life period of a first order reaction is independent of initial concentration of
reacting species. (OR) Derive Half life period of First order reaction,
Q.Show that for a Zero order reaction of half life period is directly proportional to initial
concentration of the reactants.(OR) Derive Half life period of Zero order reaction
Q. Differences between Order and molecularity
Q. Units for different orders of reaction.
Q. Explain temperature Co-efficient of a reaction.
Q. Arrhenius equations and explain the terms.
Q. Explain with Graphs for i) Effect of catalyst ii)Effect of temperature.
Q.Define i) Threshold Energy iii) Activation Energy iii) Collision Frequency
Q.Problems on calculation of t1/2 and K of first order reaction.
1. 50% Of a 1st order reaction is completed in 40 minutes. calculate the time required to
complete 65% of the reaction.
JI
2. 70% Of a 1st order reaction is completed in 23 minutes. calculate the rate constant of a
reaction.
Q.Problems on calculation of Ea by using Arrhenius equation.
1.The rate of a specific reaction doubles when a temperature changes from 350K to
360K.calculate the energy of activation.
0
2.The specific reaction rate of a reaction quadruples when the temperature changes from 30 C
0
to 50 C calculate energy of activation of the reaction.
LA
-1 -1
3. The rate constant of a reaction at 500K and 700K are 0.02 S and 0.07S
respectively.calculate the energy of activation of the reaction.
The d and f Block Elements
Q. Write the reactions involved in the manufacture of potassium dichromate.
Q. How is potassium permanganate is manufactured from pyrolusitc?
Q. What is (i) Lanthanide contraction (ii) Actinoid contraction?
Q. 3d-series elements exhibit variable oxidation states.Why?
A
Q.What are interstitial compounds? Write any 2 characteristics of interstitial compounds.
Q. Transition elements shows catalytic property. Give two reasons.
Q.Many copper (I)compounds are unstable in aqueous solution and undergoes disproportionation.
Give Reason.
Q.Explain the magnetic properties of transition elements. Give the formula to calculate magnetic
moment.
B
Q.Transition metals form large number of complex compounds.Give reasons.
Q.Calculate the magnetic moments of a divalent ion in aqueous solution if its atomic number is 25.
+2 +2
Q. Calculate the magnetic moment of Mn , Zn .
Q.What is Lanthanoid contraction? Mention any 2 consequences of it.
Q.Study of actinide elements is difficult.Give two reasons.
Q.What is the composition of Mischmetal?
Q.Give any 2 differences between Lanthanoids and actinoids.
Q.Complete the following reactions.
i) 4Ln + 3O2
ii) 2Ln + 6H2O
iii) 2Ln +N2
CLASSES BY ANKUR SIR @7983744732
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