88810

I IIIIII IIIII IIIII IIIII IIIII IIIIIIII

Semester

B.Sc.Ed./M.Sc.Ed.

Nov./Dec.

(CBCS) Ch'emistryand Bonding Structure

...Atomic Time:

Examination,

-

2 Hours

50

Max. Marks

Instruction:

Answer

all the questions

a) Write any three postulates confined

2015

of quantum

in a one dimensional

following mechanics

box of length

internal

choice.

and if nitrogen

10 nm. Calculate

molecule

its ground

is

state

5

energy.

b) A beam of X-rays with wavelength 0.24 nm is directed toward a sample-. The X-rays scatter from the electrons within the sample, imparting momentum to the electrons, which are initiajly at rest in the lab frame. After scattering, the X-rays are det..ected at various angles relative to the direction of the incoming beam using a detector that can resolve their wavelength. ~ i) What is the longest wavelength ii) For this scattering electrons.

angle

measured

5

by the detector ?

what is the kinetic

energy

'i(, of the r~,GOiling

OR II

a) Explain dual nature of matter on the basis of de Brog1ie relation. Give experimental evidences.

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b) Describe the radial probability

5

function for various atomic orbitals

III. a) What is covalent radii, Vander Waals radii and ionic radii ? Explain how they vary across the period and down the group. b) Discuss the anomalous

properties

of lithium and beryllium.

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OR IV

a) Classify following oxidases chemical equations.

neutral, acidic, basic or amphoteric

with suitable

5

CO, 8203, Si02, C02, A12O3' Pb02, Ti2O3 b) Discuss the relationship electron affinity .

between electronegativity

I ionization energy and

5 P. T.O.

88810

v

I IIIIII IIIII IIIII IIIII IIIII IIIIIIII

a) Define lattice energy. the terms

involved

How it can be determined

by Born-Haber

cycle ? Explain

in it.

b) Give an comparative

5

account of Schottky defect and Frankel defect,

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OR VI

a) What What

is meant

by polarization

are the effects

of polarization

b) What is hybridisation VII

of ions ? State

Fajan's

rule of polarization

?

5

? Explain the structure

and shapes of BF 3and CO2

5

a) Construct MO energy level diagram for N2 molecule. Identify HOMO and LUMO and calculate the bond order. Write the electronic configuration of N2 molecule.

5

b) Write the coefficients of atomic orbitals involved in Sp, Sp2 and Sp3 hybridisation.

5

OR VIII. a) Construct

MO energy level diagram for CO molecule.

configuration.

identify HOMO, LUMO and predict the magnetic behaviour.

b) Discuss the structure IX

Write the electronic

of diborane.

1.

Answer any two of the following: a) A photon of wavelength

: ,,~ '(2x5=10)

4000 A o strikes a metal surface. The work function of

the metal being 2.13 eV, calculate i) The energy of the photon in eV.

,;

,:. (;~ ~ ,

ii) The kinetic energy of the emitted photoelectron. b) State Hund's rule. Calculate ofZn atom. c'

Explain molecular

the formation orbital

i) Fuller enes ii) Carbid~s.

of conductance

theory .

d) Write a short note on

effective

nuclear charge on 4s and 3d electron bond and valence

. bond in metals

using

5 5