chemistry Pass 4th sem 2016 question paper. | Assam University
TDC Even Semester Exam., 2016
CHEMISTRY
(Pass)
( 4th Semester )
Paper No. : CHMP-401
(Inorganic, Organic and Physical Chemistry)
Full Marks: 35
Pass Marks: 12
Time: 2 hours
The figures in the margin indicate full marks for the questions
GROUP A
(Inorganic Chemistry)
( Marks : 11 )
Answer one question from each Unit
UNIT I
2. [Ni (NH3)5]2 is a high-spin complex whereas [CoNH3)6J3 is a low-spin complex. Explain.
UNIT—Il
3. Describe the causes and consequences of acid rain. 3
4. Describe briefly the pollution caused by excess use of pesticides and fertilizers.
UNIT—Ill
5. Describe the principle of flame photometiy.
6. What is ion exchanger? Write the uses of ion exchanger.
UNIT—IV
7. What is Portland cement? Give the average composition of cement.
8. What is the role of water and gypsum in the setting of cement?
GROUP—B
(Organic Chemistry) (D
(Marks:12) cC
Answer one question from each Unit
UNIT—I
9. Write the general methods for the preparation of primary, secondary and tertiary amines with necessary reactions. 3
10. What happens when (write only reactions)—
(a) propionamide is treated with an aqueous solution of KOH and bromine;
(b) acetone oxime is treated with LiAIH4?
UNIT—II
11. Briefly describe the secondary structure of protein. 3
12. (a) What is peptide linkage? 1
(b) What do you mean by denaturation of protein? 1
(c) Which base of DNA is not found in RNA? 1
UNIT—Ill
13. What happens when—
(a) urea is heated above its melting point;
(b) urea is heated with dilute NaOH?
14. (a) How is barbituric acid prepared from urea?
(b) Write one method of preparation of urea. Mention its important use.
UNIT—IV
15. (a) Write a short note on column chromatograpy.
(b) What is meant by Rf value?
16. (a) Briefly describe thin-layer chromatography.
(b) Give one example of liquid-liquid chromatography.
GROUP—C
(Physical Chemistry)
(Marks:12)
Answer one question from each Unit
UNIT—I
17. State and explain Le Chatelier’s principle taking suitable example. 3
18. The equilibrium constant (Ks) for the equation
2N02(g)2N0(g)+02(g)
is 17x1O at 500 °C. What is the numerical
value of the equilibrium constant for the
following reaction?
NOg)+O2=NO2(g) 3
UNIT—Il
19. For a gaseous reaction
rR+sSxX+yY
establish the relation between K and K.
20. Write the relation between equilibrium constant (Kr) and standard Gibbs’ energy. Hydrolysis of sucrose gives glucose and fructose. If the equilibrium constant (ICe) for the reaction is 2x10’3 at 300 K, calculate AG° at the same temperature. 1+23
UNIT—III
21. (a) Differentiate between molecularity and order of a reaction.
(b) What are the orders of reactions having the following rate constants?
(i) k = F7x105 L mo11 s (ii) k=43x1O4 s
(iii) k=54x103 mol IT’ s
22. The rate constant of 1 15x103 &‘. How reactant take to reauce tO 2 g? a first-order reaction is long will 5 g of the
UNIT—IV
23. Define activation energy. The rate of a chemical reaction doubles for an increase of 10 K in absolute temperature from 298 K. Calculate the activation energy. 1 +2
24. Write Arrhenius equation explaining the terms involved. The activation energy of a reaction is zero. Will the rate constant of the reaction depend on the temperature? Give reason. 1h/2+1Y2
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