Assignment for Unit Test-ii, Std-xii
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Last Date for Submission-05-09-2019
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Topic:Chemical Kinetics
1.For a reaction A + B ® Product, the rate low is given by r = k[A]½ [B]2. What is the order of the reaction ?
2.The rate of a particular reaction quadruples when the temperature changes from 293 K to 313 K.Calculate activation energy.
3.If the decomposition of nitrogen oxide as follows a first order kinetics
- Calculate
the rate constant for a 0.05M solution if the instantaneous rate
is 1.5 ´ 10–6 mol/l/s ? - What concentration of N2O5 would give a rate of 2.45 ´ 10–5 mol L–1 S–1?
4.The decomposition of hydrocarbon follows the equation K = (4.5 ´ 1011S–1) e–28000k/T. Calculate Ea.
5. A reaction is of second order with respect to a reactant. How is the rate of reaction affected if the conc. of the reactant is reduced to half? What is the unit of rate constant for such a reaction?
Topic:Alcohols,Phenols and Ethers
6. How is phenol obtained from aniline ?
7.Ethanol has higher boiling point than methoxy methane. Give reason.
8. How will you convert :
(i) Phenol to cyclohexanol (ii) Benzene chloride to benzyl alcohol (iii) Anisole to phenol
9. Phenol, when it first reacts with concentrated sulphuric acid, forms Y. The compound, Y is reacted with concentrated nitric acid to form Z. Identify Y and Z and explain why phenol is not converted commercially to Z by reacting it with conc. HNO3 .
10. Ethers are relatively inert. Justify.
11. Lower alcohols are soluble in water, higher alcohols are not. Why ?
12. Give equations of the following reactions :
(i) Oxidation of propan-1-al with alkaline KMnO4 solution.
(ii) Bromine in CS2 with phenol.
(iii) Treating phenol with chloroform in presence of aqueous NaOH.
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