Time: 3 Hrs.
Max. Marks: 80
General instructions:
- Section A:
Q. 1 contains Ten multiple choice type ofquestions, each carrying One marks.
Q. 2 contains Eight very short answer type questions, each carrying one mark. - Section B:
Q. 3 to Q. 14 contain Twelve short answer type questions, each carryingTwo marks. (Attempt any Eight) - Section C:
Q. 15 to Q. 26 contain Twelve short answer type questions, each carrying Three marks. (Attempt any Eight) - Section D:
Q. 27 to Q. 31 contain Five long answer type questions, each carrying Four marks.(Attempt any Three). - Use of log table is allowed. Use of calculator is not allowed.
- Figures to the right indicate full marks.
- For each multiple choice type of question, it is mandatory to write the correct answer along with its alphabet, e.g. (a)……/ (b)……./ (c)………etc. No marks shall be given, if ONLY the correct answer or the alphabet of correct answer is written. Only the first attempt will be considered for evaluation.
- Start answer to each section on a new page.
- Given :
i) R=8.314 J.K-1. mol-1
ii)NA=6.022 x 1023 m/s
iii) F=96500 C
Section-A
Q.1 Select and write the correct answers for the following multiple choice type of questions: [10]
i. Schottky defect is NOT observed in ________.
(A) NaCl
(B) KCl
(C) AgBr
(D) Nio
ii. The freezing point of 0.1 m aqueous solution of urea, if Kf for water is 1.86 K kg mol-1 is _____.
(A) 1.86 oC
(B) – 1.86 oC
(C) 0.186oC
(D) – 0.186oC
iii. Ozone layer is depleted by _____.
(A) NO
(B) NO2
(C) NO3
(D) N2O5
iv. When excess of AgN03 is added to a complex, one mole of AgCl is precipitated. The formula of complex is
(A) [CoCl2(NH3)4]Cl
(B) [CoCl(NH3)5]Cl2
(C) [CoCl3(NH3)3]
(D) [Co(NH3)6]Cl3
v. The value of ∆ng for the oxidation of 4 mole of sulphur dioxide to sulphur trioxide is ______.
(A) -2
(B) 2
(C) -4
(D) 4
vi. One dimensional nanostructure amongst the following is _____.
(A) Nanoparticles
(B) Nanotubes
(C) Nanofilms
(D) Nanorods
vii. Which formula co-relates degree of dissociation and concentration of electrolyte?
(A) c=\sqrt{\frac{ka}\alpha}
(B) \alpha=\sqrt{\frac{Ka}c}
(C) c=\sqrt{K_a\alpha}
(D) c=\sqrt{\frac\alpha{K_a}}
viii. The highest acidic compound among the following is______.
(A)
(B)
(C)
(D)
ix. The formula used to calculate molar conductivity of an electrolyte is______.
(A) \Lambda=\frac{1000c}k
(B) c=\frac{1000\Lambda}k
(C) \Lambda=\frac{1000k}c
(D) k=\frac{1000}{\Lambda c}
x. Which of the following is a secondary amine?
(A) Cyclohexylamine
(B) Isopropylamine
(C) Diphenylamine
(D) N, N-Dimethylamine
Q.2. Answer the following questions:
i. Write the structural formula of N, N-dimethylethanamine.
ii. Write the reagents used for the reduction of carbonyl group in Clemmensen’s reduction.
iii. Write the IUPAC name of isoprene.
iv. The rate law equation for A → Product, is rate =K[A]x. What is the effect of increase in concentration of ‘A’ on rate of reaction, if x < 0?
v. What is the molality of an aqueous solution of KBr having freezing point —3.72oC
(Kf for water is 1.86 K kg mol-1)?
vi. Write the balanced chemical equation, when excess of ammonia is treated with chlorine.
vii. Write the number of donor atoms present in EDTA, during fonnation of complex.
viii. Write the names of the metal elements in brass alloy.
Section-B
Attempt any EIGHT of the following questions: [16]
Q.3. Derive the relation between half-life and rate constant for a first order reaction.
Q.4. a. State Henry’s law. (b) Define: Osmotic pressure.
Q.5. Write the differences between lanthanoids and actinoids.
Q.6. Write anomalous behaviour of oxygen with respect to:
i. Atomicity
ii. Oxidation state
iil. Magnetic property
iv. Nature of hydrides
Q.7. What is the action of:
i. liquid bromine in acetic acid on anisole
ii. Soda-lime on sodium acetate?
Q.8. Calculate the work done in KJ in a reaction, if volume of the reactant decreases from 8 dm3 to 4 dm3 against 43 bar pressure. [1 dm3 bar = 100J]
Q.9. Explain ionization isomers with suitable example in complexes.
Q.10. Write preparation of glucose from sucrose.
Q.11. How many coulombs of electricity is required to produce lg of sodium metal by reduction of
sodium ion?
Q.12. Write the structural formula and IUPAC name of the alcohol having molecular formula C4H100 which does not undergo oxidation under normal condition.
Q.13. Identify ‘A’ and ‘B’ in the following reaction and rewrite the complete reaction:
Q.14. Write the reaction for the preparation of:
i. acetaldehyde by Rosenmund reaction.
ii. benzaldehyde by Gattennan-Koch formylation.
Section-C
Attempt any EIGHT of the following questions: [24]
Q.15. Write the general electronic configuration of 3d series. Draw the structures of sulphuric acid and
thiosulphuric acid.
Q.16. Define conjugate acid-base pair. The hydroxyl ion concentration in aqueous solution of NaOH is
2 x 10-4 mol dm-3. Calculate pH of the solution.
Q.17. what is atom economy? Explain any two applications of nanomaterials.
Q.18. What is peptide bond? How is it formed? Write the name and fonnula of the reagent used to convert
alkylhalide to nitroalkane.
Q.19. a. Write the reactions for the action of following reagents on phenol:
i. Nitrating mixture
ii. Zinc dust
b. What is the action of phosphorous pentacholoride on ethyl methyl ether?
Q.20. a. Write the formula to calculate EAN.
b. Explain formation of [CO(NH3)6]3+complex ion with respect to:
i. Type of hybridisation
ii. Magnetic property
Q.21. a. Calculate spin only magnetic moment of M2+ion.
[automic number of M = 26]
b. Write condensed electronic configuration of Gadolinium.
[Z = 64]
Q.22. a. Write the reducing agents used to convert Fe203 to ‘Fe’ in the reduction zone of blast furnace.
b. Write chemical equations involved in:
i. Carbylamine reaction for ethylamine.
ii. Hoffmann Bromamide degradation for acetamide.
Q.23. a Explain Cannizzaro’s reaction with the help of benzaldehyde.
b. Write the reaction for the conversion of cyclohexene to adipic acid.
Q.24. a. Define zero order reaction.
A reaction takes place in two steps:
i. NO_{\left(g\right)}+Cl_{2\left(g\right)}\rightarrow NOCl_{2\left(g\right)}
ii. NOCl_{2\left(g\right)}+NO_{\left(g\right)}\rightarrow2NOCl_{\left(g\right)}
Write the overall reaction and identify the reaction intermediate.
Q.25. ∆H for fonnation of ethane gas is —84.4 kJ at 300 K. Calculate ∆U for the reaction.
Q.26. Mention the types of polymers formed on the basis of intermolecular forces. Write any two uses of
low density polyethylene.
Section-D
Attempt any THREE of the following questions: [12]
Q.27. a. An element with molar mass 27 g/mol forms a cubic unit cell with edge length 405 pm. If density of the crystal is 2.7 g cm-3, identify the type of unit cell.
b. Derive the equation of Raoult’s law for binary solution containing non-volatile solute.
Q.28. a. State whether entropy change is positive or negative in the following examples:
i. Melting of ice
ii. Vaporisation of a liquid
b. Explain ‘common ion effect’ with example.
Q.29. Draw a neat and labelled diagram of a lead accumulator cell. Write the overall reactions taking place at cathode and anode during discharging of the cell.
Q.30. a. Define a unit cell.
Which colour is shown by NaCl crystal due to formation of F-centre?
b. Why does fluorine show anomalous behaviour in ‘ 17 group’ elements?
Q.31. a. Write salient features of SN2 mechanism.
b. what is the action of following reagents on bromomethane:
i. bromobenzene
ii. mercurous fluoride
