Q l.

A mixture of CuO and Cu20 with a mass of IO·SO g is reduced to give 8·66 g of pure Cu metal. What are the amounts of CuO and Cu20 (in in the original mixture?

To a mixture of sr2+ and Bn2+ solution, Na2SO4 solution is added gradually. Which one of the two will be precipitated first?

Given:

Ssrso4 2·8 x
SBaS04 4.2 X 10^-11

Aniline is a weak organic base in aqueous solutions. Suggest a solvent in which aniline con become a strong base with proper scientific reason.


Explain the scientific basis of functioning of fluoride ion selective electrode.

Discuss the effect of organic solvents in AAS measurement.

How does flame ionization detector work Name two compounds that cannot be measured by this detector.

Explain how proximity analysis of coal can be determined by thermogravimetric analyzer.


0.1 g of dolomite ore was acid digested and a stock solution was prepared in a 25 mL volumetric flask using de-ionized water. An aliquot of 1 mL
of the stock solution was pipetted into 100 mL volumetric flask and the volume was made up by de-ionized water. This solution was subjected to
analysis of Fe content by ICP-M.S. Aft.er suitable calibration, the output of ICP-MS analysis showed Fe concentration as 4 µg/g. Find the concentration of Fe in the dolomite ore in 11gfg.


Q2. Arrange the following mixture of oxidant-fuel combination in the increasing order of name temperature in AAS
air-acetylene; air*natural gas; nitrous oxide>acetylene; oxygen-acetylene

Explain the Doppler broadening effect in AAS.








Explain the principle of XRF technique and comment how this technique is useful for qualitative and quantitative analysis. Arrange the L and
M X-ray of Au in energy dispersive XRF.


A mineral corresponding to orthorhombic system was studied by XRD using X-rays of wave length A 1·54 A. The X·ray reOection planes from using X-rays of wavelength λ 1.54 A. The X-ray reflection planes from
and were observed at 2tt 22·5°, 9·8° and 28·8 respectively. Find the dimension of the unit cell and the number of molecules of the mineral in the unit cell.

Given:

Molecular wei11ht of the mineral 140 g/mol

Density of the mineral e 4·2 g/cm^3



Q3. Compare the features of different types of detectors used in HPLC system.


What is correlation index in petroleum analysis How is it useful for classification of petroleum



Match the combination for cellulose powder and sephadex gel as sorbents with the chromatographic mechanisms and applications listed
below in columns A and respectively

src='./qimages/7975-3c.jpg'>

What is the principle involved in ICP·MS analysis Why should high
What is the principle involved in ICP-MS analysis Why should high salt content be avoided during sample preparation for ICP-MS analysis 10

Q4. A mixture of KMnO4 and K2CrO4 weighing on being
treated with acidic Kl solution is found to liberate iodine to react with 60 ml of
0.1 N Na2S203. Find out the percentage of Cr and Mn in the mixture




Calculate the concentration of Ni2+ in a solution that was prepared by mixing 50 mL of 0·0500 f 0 0500 M EDTA. The mixture was buffered to a pH of 3·0.

Given:



Formation constant of
Ni2+. EDTA complex: 4·2 x 10^18

α4 for Ni2+. EDTA


complex at pH 3·0 2·51 x 10^-11



Explain the functions of
Diphenylamine sulphonic acid

Methyl yellow
as indicators.

Q5. Write a balanced net ionic equation for the following reactions:

src='./qimages/7975-5a.jpg'>

A compound X contains only carbon, hydrogen, nitrogen and chlorine. When l.00 g of X is dissolved in water and allowed to react with excess
AgN03, 1·95 g of Agcl is collected. When 1.00 g of X is subjected to complete combustion, 0·900 g of C02 and 0·735 g of H20 are formed. What is the empirical formula ofX?

Are the equivalence point and end point the same? Justify your answer.
Are the equivalence point and end point the same Justify your answer.

Calculate the molar concentration, and molality of a sulphuric acid solution of density 1·198 g/cm^3 containing 27% H2SO4• by weight.





Q6.
Explain why p-nitrophenol is more acidic than m-nitrophenol.


Draw pi molecular orbital diagram of the following species

src='./qimages/7975-6b.jpg'>

Explain why acetaldehyde is more reactive than benzaldehyde for nucleophilic addition reaction.


Arrange the given carbocations in their decreasing order of stability and give reasons for your answer.

src='./qimages/7975-6d.jpg'>


Explain why
src='./qimages/7975-6e.jpg'>

is more basic than aniline although both are aromatic primary amines.



Which one of the following compounds has higher dipole moment and why


src='./qimages/7975-6f.jpg'>

Explain why one of the following compounds gives SNl reaction


src='./qimages/7975-6g.jpg'>





Complete the following reaction and give the structure of the compounds •
reaction and give structure of compounds
src='./qimages/7975-6h.jpg'>


Q7. Complete the following reactions and give their mechanisms

src='./qimages/7975-7a.jpg'>


How can the following conversions be achieved Provide suitable methods which give good yields.
src='./qimages/7975-7b.jpg'>

Complete the following reaction and give the structure of and

src='./qimages/7975-7c.jpg'>

Q8. Complete the following reactions and give the stereochemistry o f the
product(s):

src='./qimages/7975-8a.jpg'>


Complete the following reactions and provide stereochemistry o f the
product

src='./qimages/7975-8b.jpg'>
How can the following conversions be achieved

src='./qimages/7975-8c.jpg'>


Q9. What are the characteristics of pericyclic reactions Give p i molecular
orbital diagram of 1,3,5-hexatriene. Indicate

Ground state HOMO and LUMO, and

Excited state HOMO and LUMO of the system.

Complete the following reactions


src='./qimages/7975-9b.jpg'>




Arrange vmax(C of the following compounds in decreasing order. Give reasons in favour of your answer


src='./qimages/7975-9c.jpg'>
.


Q10. Give relative intensities of the parent cations of the compounds given
below:
CH2Br2 and CH2Cl2

Indicate the number of PMR and CMR signals of the given compounds:

src='./qimages/7975-10b.jpg'>

AD organic compound C6H1202 give the following spectral data


U V λmax 283 nm. ?max 27
IR Significant absorption bands at 3460, 2900 and 1705cm^-1

PMR: δ 1·3 2·2 and 3·8 exchangable with

2*5 2H).

CMR (off-resonance decoupled) Two singlets, one triplet and one
quartet. One of the singlets is at 210 pm and the other at
quartet.
Mass Prominent peaks at m/z 116, 58 and 43.


Deduce the structure of the compounds and explain the spectral data.