MFS 2008 Chemistry Optional Question Paper

Q1.

(a) Attempt any four of the following:
Explain: Why is it impossible to measure simultaneously the position and velocity precisely of an electron?

(b) Define osmosis and osmotic pressure. Derive relation between osmotic pressure of solution and molecular mass of solute.

(c) Discuss the type of hybridisation and shape of PCl5 molecule. Comment on reactivity of the molecule. What do you understand by reactive intermediates?

(d) Discuss any one of them with respect to structure and stability. Explain with suitable example the formation of ionic bond. Give the characteristics of ionic compounds.

Q2. (a) What are polymers? How are they classified? Differentiate between addition and condensation polymerisation.

(a) What are polymers? How are they classified? Differentiate between addition and condensation polymerisation.

(b) Explain why molecular spectra is also called band spectra.
(i) Explain shielding and deshielding effects in nmr spectra. Predict the high
(ii) resolution nmr spectrum of CH₂Cl-CHCl 2 .

(c) Give an account of manufacture of superphosphate of lime. Explain what is Thomas slag. 10
3. Write the structure, two properties and two uses for nylon 6 and (a) urea-formaldehyde resin. Show that frequencies of fundamental, first and second overtone bands are (b)
(i) approximately in ratio 1:2:3 for anharmonic vibrations. 08 Explain how will you differentiate between CH₃-CH₂-CHO and
(i) CH2 = CH-CH2OH using infrared spectra. What are agrochemicals ? How are they classified ? Give the structures for
(c) Parathion, indole-3-acetic acid and monocrotophos. SECTION-B What is Joule–Thomson effect? Prove that enthalpy of a system remains constant 10
4. (a) in an adiabatic expansion. (b)
(i) Giving reason explain that specific conductance of an electrolyte decreases while molar conductance increases on dilution. The molar conductance of NaCl, HCl and CH 2 ClCOONa at 298 K and at infinite dilution are 0.01264, 0.0426 and 0.00898 \barS m 2 mol -1 . Calculate the molar conductance at infinite dilution for monochloroacetic acid. Describe how solubility product of a sparingly soluble salt can be determined
(ii) using chemical cell. What are the main points of Langmuir theory of adsorption. Show that Freundlich
(c) isotherm is special case of Langmuir isotherm.

• (a) What are polymers? How are they classified? Differentiate between addition and condensation polymerisation.
• (b) Explain why molecular spectra is also called band spectra.
• (c) Give an account of manufacture of superphosphate of lime. Explain what is Thomas slag. 10

Q3. 3. Write the structure, two properties and two uses for nylon 6 and urea-formaldehyde resin. Show that frequencies of fundamental, first and second overtone bands are approximately in ratio 1:2:3 for anharmonic vibrations.
(i) Explain how will you differentiate between CH3-CH2-CHO and CH2=CH-CH2OH using infrared spectra. What are agrochemicals? How are they classified? Give the structures for Parathion, indole-3-acetic acid and monocrotophos.

Q4. (a) in an adiabatic expansion.

(a) SECTION-B What is Joule–Thomson effect? Prove that enthalpy of a system remains constant in an adiabatic expansion.
4. in an adiabatic expansion.

(b) (i) Giving reason explain that specific conductance of an electrolyte decreases while molar conductance increases on dilution. The molar conductance of NaCl, HCl and CH2ClCOONa at 298 K and at infinite dilution are 0.01264, 0.0426 and 0.00898 S m² mol^-1. Calculate the molar conductance at infinite dilution for monochloroacetic acid.
(ii) Describe how solubility product of a sparingly soluble salt can be determined using chemical cell.

(c) What are the main points of Langmuir theory of adsorption. Show that Freundlich isotherm is a special case of Langmuir isotherm.

• (a) in an adiabatic expansion. (b)
• (c) isotherm is special case of Langmuir isotherm.