Biju Patnaik University of Technology 2008-2nd Sem B.Tech (B Tech) , chemistry-I . - Question Paper
BPUT(B Tech) , second semester chemistry-I ques. paper.
Second Semester Examination - 2008 CHEMISTRY - I
Full Marks-70 Time: 3 Hours
Answer Question Afo. 1 which is compulsory and any five from the rest.
The figures in thQ right-hand margin indicate marks,
(h = 6,626 x 10 Js. Mass of e = 9.1 x 1CT31 kgr e = l.6 x f019C. c = 3x10 m/s, N = 6.023 xK)*3, ft = 8.314 JK-Vmol)
1,, Answer in brief : 2xT0
(aj Write the SchrOdinger time independent wave equation. Explain the terms.
(b) If the wavelength of an electron its one nm, what is the velocity of the electron ?
pxo.
(b) Explain the terms conductor, insulator and semiconductor on the basis of molecular orbital diagrams. 4
(c) Why magnesium behaves as a metal even if it has filled orbitals ? 2
(bj
Three uni-univalent ionic solids AB, AC and AD are composed of ions having following radii: A* = o.9nm, B- = 0.9 nm, C =1.8 nm, D~-2.7 nm. Predict the structure and coordination of each solid.
3
(c) Discuss about common defects found in
solids.
4
(a) What is a storage cell ? Write down, .the reactions taking place during charging of
lead storage cell. 2
The emf of the cell SCE11 AgCI(satd) | Ag was 0.26V at 25C. Find out the solubility of AgCI.(E: SCE=0.2415, Ag+/Ag=0.8V)
3
(c) What is quinhydrone ? How can be pH of
an unknown solution be found out using this electrode ? A quinhydrone electrode was coupled with another electrode in a BSCC 2101 5 pro
(a) Draw a neat diagram and discuss the sulphur equilibrium phase system. 5
(b)
Calculate the number of phases, components and degrees of freedom for a -mixture of n2, h2 and ammonia a|\Af| temperature at which equilibrium Ns(g) J " 3H2(g} -*2NH3(g) fe reacf(|y established.
(b)
(c)
What are the characteristics of a g00d
catalyst ?
2
(a)
A substance exists in two allotropic forms rad' rad'US = -3nm> and P(BCC, .
ad,us _ 0.37nni) Rnd ou( the rafo
ineir densities,(a/|3j *
BSCc 2101 3
<a) solution of pH5.6- Find out the potential of the unknown elect rode. (E cell 0-123V, qutnhydrone = 0.699V) 5 8 7 (a) Derive an expression for rate constant of a second order reaction in which both the reactants are different. 4 (b) (b) The decomposition of a gaseous substance AB(g) -> A(g) + B(g) follows first order kinetics. Calculate 3 (C) (i) the rate constant if pressure of *WL falls from 0.62 atm to 0.44atm in 50 seconds and (ii) pressure of AB after 75 seconds at the same temperature. (c) A first order reaction has rate constant equal to 1.5 x10~4 sec"1 at 300 K and 7.5 x10"4 sec'1at 320 K. Calculate the activation energy and the frequency factor. 3 |
Calculate the change of Gibbs and Helmholtz free energy when four moles of an ideal gas are expanded isothermally and reversibty from 5 atm to 1 atm at 300 K; 3 The ionization constant for a certain acid HA is 4.5 x10'4at 298 K. What concentration of acid would be required to produce 1H3CT] of 3 x10~3 M ? 3 Kp for SOz(g) + y2 02(g) S03(g) is 1.7 xl 021 at 300 K. Calculate Kp and Ke for 2SQ3(g) 2SOz(g) + Oz(g). 4 |
BSCC 2101
BSCC 2101 6 Contd,
-C
Attachment: |
Earning: Approval pending. |