BA(Chemistry)

Ignou Solved Assignment For AEC 01 Environmental Chemistry

superadminshashi — Mon, 23 Dec 2019 09:30:27 +0000

Ignou Solved Assignment For AEC 01 Environmental Chemistry

1. Differentiate between the following terms. Illustrate your answers.

i) Soil profile and soil horizon

ii) Disintegration and decomposition in soil formation

2. Describe the various ways to find out the exact percentage of sand, silt and clay particles in soil.

3. What are essential plant nutrients? Explain nutrient availability in soils.

4. How do the abnormal properties of water help in the operations of hydrological cycle?

5. 75cc of water sample requires 10.2 cc of 0.01 M EDTA for titration in presence of eriochrome black T indicator. Calculate the total hardness.

6. What are the problems associated with monitoring by physical & chemical methods?

7. How do water vapours and carbon dioxide contribute to the phenomenon of global warming?

8. What do you understand by ozone layer depletion? Enlist various effects of ozone layer depletion.

9. Differentiate between the following:

i) Particulate and Gaseous pollutants

ii) Dry adiabatic lapse rate and environment lapse rate

10. Write the principle involved in chemiluminescence and spectrophotometry for air pollutant determination. Also state the pollutants which can be analysed using these methods.

11. Briefly explain the methods which are used for reducing waste water quantity.

12. List the characteristics of an ideal pesticide.

13. Which gases are present in untreated waste water?

14. What are nuisance organisms? Give their effects with suitable examples.

15. Describe the process of sampling of soil.

1. Differentiate between the following terms. Illustrate your answers.

i) Soil profile and soil horizon ii) Disintegration and decomposition in soil formation

16. Expand EDTA and write its structure. How is this reagent used in titrimetric analysis? Explain.

17. Describe the mechanism of ion exchange in ion exchange chromatography and illustrate your answer.

18. Enumerate the steps followed in measuring pH using a pH meter.

19. Give a graphical presentation of absorption spectral data indicating the max and  values in it. Illustrated your answer.

20. Enlist the precautions that should be followed in taking water samples for bacteriological analysis.

superadminshashi Mon, 12/23/2019 - 15:00

₹300.00

SKU

1243145

Price

₹300.00

University

BA(Chemistry)

Subject Code

AEC 01 Environmental Chemistry

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 10 Spectroscopy

superadminshashi — Mon, 23 Dec 2019 09:19:50 +0000

Ignou Solved Assignment For Che 10 Spectroscopy

1. Illustrate what is an electromagnetic radiation. Define various parameters associated with it.

2. What are term symbols? Derive the term symbols for the p state of the hydrogen atom.

3. (a) Give the shapes of the following molecules:

(i) HgCl2

(ii) SnCl2

(iii) ClF3

(iv) XeF4

(v) PCl5

(vi) PF3

(b) Show that a two fold axis of symmetry is present in water molecule.

4. Illustrate the symmetry elements present in benzene molecule. What is its point group?

5. Discuss the origin of various spectral lines the rotational spectrum of a diatomic molecule. Draw a suitable diagram also.

6. Draw and explain the infrared spectral bands for HCl molecule.

7. Explain the following terms:

(i) Vibrational term value

(ii) Anharmonicity

8. (a) How many normal modes of vibration are possible for a (5)

(i) linear molecule, and

(ii) Non-linear molecule? b) Draw the stretching and bending modes for CH2 group.

9. Briefly explain the bands which are observed in the 4000-2500 cm1 region of IR spectra for various organic molecules.

10. Discuss important aspects of polarised Raman spectrum.

11. Explain Born-Oppenheimer approximation with the help of a suitable diagram.

12. Write the ground state electronic configuration of ethylenic chromophore. Discuss the possible electronic transitions for this chromophore using a suitable diagram.

13. Give reason for the following:

(i) Mercury iodide is red in colour.

(ii) An aqueous solution of NiSO4 is green in colour which turns deep blue on addition of ethylenediamine.

14. Discuss the predissociation using a suitable diagram.

15. (i) What is the role of littron mirror in IR spectrometre?

(ii) Why can glass cell not be used for IR spectroscopy?

(iii)What is the significance of monochromators?

(iv) What are the sources of radiation in Raman spectrometre?

(v) What is the significance of laser beam in Raman spectroscopy?

16. What is nuclear Zeeman effect? Why is this observed? Explain.

17. What is relaxation phenomenon? Explain its importance and different types.

18. How is an esr spectrum recorded? Explain. Also draw the block diagram of the esr spectrometer.

19. Explain simple cleavage for alkanes and the fragments obtained in the mass spectrum by taking a suitable example.

20. Explain the spectral data expected for 2-butanone.

superadminshashi Mon, 12/23/2019 - 14:49

₹300.00

SKU

1242701

Price

₹300.00

University

BA(Chemistry)

Subject Code

Che 10 Spectroscopy

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 09 An Elective Course in Chemistry and Life Sciences

superadminshashi — Mon, 23 Dec 2019 08:38:12 +0000

Ignou Solved Assignment For Che 09 An Elective Course in Chemistry and Life Sciences

Answer all the questions given below.

1. a) How are peroxisomes and lysosomes generated in a cell? What are their functions?

b) Describe different modes through which cell membrane controls the transport of ingoing and outgoing molecules?

2. a) What are anomers? Explain the existence of anomers in sugars taking D-glucose as an illustrative case.

b) Describe the various ways of classifying carbohydrates. Give examples for each class.

3. a) What prostaglandins and leucotrienes? Give their functions.

b) Elaborate on the role of t-RNA in protein biosynthesis.

4. a) Describe the ways of classifying amino acids and give example of each class.

b) What are the structural and functional differences between myoglobin and haemoglobin?

4. a) Describe the ways of classifying amino acids and give example of each class.

b) What are the structural and functional differences between myoglobin and haemoglobin?

5. a) What is Michaelis-Menton equation? Explain the significance of Vmax and Km is this equation.

b) What is the difference between macrominerals and trace elements? Write the main functions of any two trace elements.

6. a) How is the standard free energy for chemical reactions different from the standard free energy for biochemical reactions? With the help of an example explain the significance of coupling in biological reactions.

b) Standard free energy change alone cannot predict the direction of a biochemical reaction. Comment.

7. a) Explain the mechanism of action of the enzyme aconitase on citrate in TCA cycle.

b) Compare the energetics of metabolic oxidation of glucose and a fatty acid.

8. a) Explain in brief the regulation of glycogen metabolism.

b) How many moles of ATP and NADPH are required to convert 6 moles of CO2 to fructose-6-phosphate? Give all the reactions involved.

9. a) Describe the process of RNA transcription.

b) What is the role of ribosomal P-site and A-site in protein biosynthesis? How does streptomycin perform its antibiotic function?

10. a) What is genetic engineering? Describe any one of its applications.

b) Write the structural features of an antibody molecule. Discuss any one mechanism by which antibodies interact with antigens.

superadminshashi Mon, 12/23/2019 - 14:08

₹300.00

SKU

1241177

Price

₹300.00

University

BA(Chemistry)

Subject Code

Che 09 An Elective Course in Chemistry and Life Sciences

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 05 Organic Chemistry

superadminshashi — Mon, 23 Dec 2019 07:44:11 +0000

Ignou Solved Assignment For Che 05 Organic Chemistry

1. (a) Give the IUPAC names of the following compounds:

(i) CH3CHCHCH3 CN CH3

(ii) CH3CH2OCH2CHCH3 CH3

b) Explain the type of hybridisation present in ethyne using suitable diagrams.

2. Explain asymmetric synthesis using suitable examples.

3. Draw and explain the energy profile associated with ring flipping of chair conformation of cyclohexane.

4. Give reasons for the following: (2+2+1)

(i) 2, 2-Dimethylpropane has higher melting point than pentane.

(ii) -carotene is red in color.

(iii) The region of IR spectrum between 675 cm1 and 1250 cm1 is called fingerprint region.

5. What is tautomerism? How is it different from resonance?

6. (a) Explain the following:

(i) Wurtz reaction, has limited synthetic applications.

(ii) Alkanes are relatively unreactive or do not react with most of the common reagents.

(iii) Physical constants like boiling points, densities, etc. of alkanes generally increase with increase in the number of carbon atoms.

(b) Give one example each of the following reactions:

(i) Sabatier-Senderens reaction

(ii) Decarboxylation of the carboxylic acid

7. (a) Explain Saytzeff rule giving suitable example

(b) Give mechanism of the following reactions:

(i) Birch reduction

(ii) Wittig reaction

(iii) Dehydrohalogenation of alkyl halides

8. (a) What is difference between Markownikoff’s and anti Markownikoff’s rules? Explain with a suitable example.

9. (a) Explain the following:

(i) The theoretical value of evolved, when hydrogens are added to benzene, is quite high as compared to the experimental value.

(ii) Nitrobenzene does not undergo Friedel-Crafts alkylation.

(b) What do you understand by para-directing activators, para-directing deactivators and meta-directing deactivators?

10. (a) Explain the following:

(i) 1-Position in naphthalene is more reactive than the 2-position towards electrophilic substitution.

(ii) Pyrrole is more basic than pyridine.

(b) Predict the products of the following reactions:

i) Oxidation of propylbenzene

ii) Friedel-Crafts acylation of pyrrole

iii) Friedel-Crafts alkylation of pyridine

11. (a) Taking a suitable example, write the mechanism of an SN2 reaction. Explain the effect of the structure of alkyl halides over the reaction rate.       2 1 2

(b) Explain why allylic halides are very reactive under SN1 conditions.

12. Explain the following: (a) p-Nitrophenol has higher boiling point and solubility in water than o-nitrophenol.

(b) Oxiranes are more reactive than open chain ethers.

13. Complete the following reactions:

(i) C2H5OH + SOCl2

(iii) 2-Butanol H+ /heat (i) CH Cl3/OH- (ii) H+ /H2O

(iv) CH2 CH2 O (i) RMgX (ii) H + / H2O

(v) 273 K H + CH3 -S-CH3+ H2O2

14. (a) How would you carry out the following conversions:

(i) Ketone to alkane

(ii) Alcohol to aldehyde

(iii) Ketone to alcohol

(b) What is mixed aldol condensation? Write its mechanism

15. Explain the importance and preparation of chloramines T and dichloramine T.

16. (a) Differentiate between lactones and lactides. Give one method of preparation of each of them. (3) (b) How can you convert 2-butanone to 2-methyl-2-hydroxybutanoic acid?

17. Discuss the mechanism of Hofmann rearrangement.

18. (a) Why do nitroalkanes behave as weak acids? Explain.

(b) What is TNT? How can it be prepared?

19. Briefly explain the following:

(i) Curtius rearrangement

(ii) Schmidt rearrangement

20. Discuss the secondary structure of a peptide giving suitable diagrams.

superadminshashi Mon, 12/23/2019 - 13:14

₹300.00

SKU

1240535

Price

₹300.00

University

BA(Chemistry)

Subject Code

For Che 05 Organic Chemistry

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 04 Physical Chemistry

superadminshashi — Mon, 23 Dec 2019 07:23:45 +0000

Ignou Solved Assignment For Che 04 Physical Chemistry

Note: Answer all the questions given below. The marks are indicated in the brackets.

1. a) What is the value of density of mercury non-SI units? Convert and express this quantity in SI unit.

b) List the factors on which the amount of a gas adsorbed on a solid depends.

2. State Dalton’s law of partial pressure. Derive its mathematical form.

3. Derive equation of corresponding states.

4. What are liquid crystals? Explain their different types.

5. State Bragg law. List the assumptions made by Bragg in deriving Bragg equation.

6. Derive the equation for the work of expansion for an isothermal reversible process.

7. Define enthalpy of combustion. Calculate the enthalpy of combustion of methanol if the enthalpies of formation of CO2, H2O and CH3OH are, respectively, 393.5 kJ mol1 , 285.8 kJ mol1 and 239.0 kJ mol1 .

8. Draw and explain the steps involved in Carnot cycle.

9. Discuss the dependence of chemical potential on temperature and pressure.

10. What are the characteristics of ideal and non-ideal solutions? Give one example of each type of these solutions.

11. Give the thermodynamic derivation of the distribution law.

12. What is relative lowering of vapor pressure? How can lowering of vapour pressure be measured using static method?

13. Discuss the phase diagram of water.

14. State Le Chatelier’s principle. Discuss the effect of change of concentration on the following reaction: H2(g) + I2(g) ⇌ 2HI(g)

15. For the hydrolysis of a salt of a weak acid and a weak base, show that a b w K K K h K 

16. How can ionic product be determined using conductivity measurements? Explain.

17. Discuss the working of metal-insoluble salt electrode by taking a suitable example.

18. Derive integrated rate law for the first order reactions.

19. Briefly explain the laws of photochemistry.

20. Discuss the methods of preparation of lyophilic colloidal dispersions using dispersion methods.

superadminshashi Mon, 12/23/2019 - 12:53

₹300.00

SKU

1239411

Price

₹300.00

University

BA(Chemistry)

Subject Code

Che 04 Physical Chemistry

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 02 Inorganic Chemistry

superadminshashi — Mon, 23 Dec 2019 07:18:00 +0000

Ignou Solved Assignment For Che 02 Inorganic Chemistry

Note: Answer all the questions given below.

1. Compare Mendeleev’s Periodic Table with Modern Periodic Table.

2. What is ionisation energy? Explain the difference between electronegativity and ionisation energy

3. What is difference between intermolecular hydrogen bonding and intramolecular hydrogen bonding? Explain with suitable examples

4. Electropositivity, density and atomic radii of alkali metals increase down the group. Explain.

5. Write the name and full electronic configuration of the following elements:

i) Be

ii) Mg

iii) Ca

iv) Sr

v) Ra (5)

6. What is the significance of diborane ?

7. What is borazine? Draw the valence bond structure of borazine.

8. What is the difference between valency and oxidation state? Give the rule to deduce the oxidation state

9. Discuss nitrogen cycle in your own words.

10. How would you convert benzene into nitrobenzene? What is role of nitric acid in this reaction?

11. Explain the following:

i) Carbon is the only element of Group 14, which forms stable multiple bond with an other carbon.

ii) Trihalide of boron is a trigonal planar molecule. Explain

12. What are different types of carbides? Explain each of them briefly.

13. What are the different types of interhalogen compounds? Draw one structure of each type.

14. Describe VSEPR theory. Draw the structure of the following compounds on the basis of VSEPR theory.

i) XeF4

ii) XeOF4

iii) XeO4

iv) XeF6

15. What is oxoacid? Give any one reaction for preparation of the following;

i) Sulphurous acid

ii) Sulphuric acid

iii) Peroxomonosulphuric acid

iv) Peroxodisulphuric acid

16. Explain why the decrease in atomic radius from sodium to chloride is greater than that from scandium to copper.

17. Why the experimental value of magnetic moments for the transition elements generally differ from the spin-only values.

18. Some of the lanthanides and actinides besides showing + 3 oxidation state also show other oxidation states. Which other factors may be responsible for this?

19. What are ligands? Give three examples with their structures of commonly used ligands.

20. Give details of the process of smelting pertaining to pyrometallurgy.

superadminshashi Mon, 12/23/2019 - 12:48

₹300.00

SKU

1238621

Price

₹300.00

University

BA(Chemistry)

Subject Code

Che 02 Inorganic Chemistry

Session

2019-20

Cost

₹0.00

Ignou Solved Assignment For Che 01 Atoms and Molecules

superadminshashi — Mon, 23 Dec 2019 07:07:02 +0000

Ignou Solved Assignment For Che 01 Atoms and Molecules

Attempt all the questions. Each question carries 10 marks.

1. a) For the first two lines of Balmer series, identify the values of n1 and n2.

b) Calculate the ionisation energy of hydrogen atom using Bohr’s theory.

c) Calculate the energy values of the electron in second and third orbits of hydrogen atom.

2. a) The first ionisation energies of silicon and sulphur are lower than that of phosphorus. Explain.

b) Explain use of cation to anion radius ratio.

c) Arrive at the Lewis structures of   5 4 SnCl using the steps indicated in Sec. 3.7 of and IF Unit 3.

d) The bond enthalpies of N–N, N=N and N≡N bonds are not in the ratio 1:2:3. Explain the reason.

3. a) Using Pauli’s exclusion principle, work out the total number of electrons in the level n=3.

b) For a particle in one-dimensional box, write the equations for calculating the energy values corresponding to

i) n = 1

ii) n = 2

iii) n = 3

c) Calculate the de Broglie wavelength associated with a ball of mass 0.50 kg moving with a velocity of 20 m s−1 .

d) What is a well-behaved wave function?

4. a) State the definitions of bonding, anti-bonding and nonbonding orbitals. Draw the molecular orbitals obtained by the linear combination of two 1s orbitals.

b) Write down the molecular orbital configurations of N2 and NO. Calculate their bond orders. Which of these two is expected to have paramagnetic behavior?

5. a) Assuming that the covalent radius of hydrogen is 28 pm when it is bonded to other atoms, and using Table 3.10, calculate the bond lengths of the bonds in CH2 = CH−CH2−NH2

b) Alkyl halides are more reactive than alkanes. Explain the reason.

c)  3 I ion is known to exist but not  F ion. Explain the reason after assigning Lewis 3 structures for both the ions.

6. a) Write down the structures of stereoisomers of 2, 3–pentanediol. Identify the enantiomeric pairs.

b) State the difference between the racemic mixture and meso form.

c) Suggest a method of determination of molar extinction coefficient.

7. a) Write the resonance structures of formate ion. What do you infer regarding the relative bond length values of two C−O bonds in it? Explain the reason.

b) Predict the hybridisation state of each carbon atom in the following compounds:

CH3 CH2 C CH C C CH3 CH2 CH C O O CH3 CO2

8. a) The rate constant for Cr decay is 2.89×10−7 s−1. Calculate the time required for 87.5% decay.

b) Explain the method of determining the age of an organic material.

c) Explain the following terms: i) Moderator and ii) Breeder reactor.

9. a) Among the molecules given below, identify those which are microwave active. Br2, HF, CO2 and CO

b) Write down the values of two characteristic frequencies for each of the following compounds:

i) C CH

ii) H3C CH3 OH

iii) H3C H

c) State the condition to be satisfied for a molecule to absorb in the microwave region.

10. a) Give an example for each of the following types of nuclear transmutation reactions:

(p, α), (n, p), ( n, α) and (p, n).

b) An analyst is asked to oxidize a secondary alcohol to ketone. What single characteristic feature in IR spectra should the analyst look for in order to verify the feasibility of the reaction?

c) Which of the following has higher λmax value? 1-butene or 1, 3 – butadiene. State the reason.

superadminshashi Mon, 12/23/2019 - 12:37

₹300.00

SKU

1237180

Price

₹300.00

University

BA(Chemistry)

Subject Code

Che 01 Atoms and Molecules

Session

2019-20

Cost

₹0.00