Chemistry (Paper-B) B.Sc. 1st year

Punjabi University Collage Ghudda

(Mid-Term Exam) Session- 2020

Subject : Chemistry (Paper B)                                                Class : B.sc I(NM)

Time : 1:30 Hrs                                                                         Max. Makrs 20

Note: The candidates are required to attempt any three question from Section A  carrying 5 marks each and attempt any 5 question from Section B  carrying 1 mark each.

SECTION – A

Q 1.  Drive and explain all term of  Schrӧdinger wave equation.                                        (5)

Q.2 Which of the following sets of quantum numbers are impossible for an electronin an atom, and why?

       i) n=3, l=2, m= -2, s=0                                                                                                        (3)

b) Give the values of  ‘n’  and  ‘l’ for the following:    5f  and   6g                                             (2)

Q.3 a) Why do Cu and Cr shows anomalous electronic configuration.                                      (3)

       b)  Why is the 4s-orbital lower in energy than 3d-orbital?                                                  (2)

Q.4 (a) Explain the structure of XeO2F2 .                                                                                  (4)

        (b) Complete the reaction:

                      XeF4  +  2H2                                                                                                                           (1)

Q.5 (a) What promoted N. Bartlett to conjecture that the fluorides of Xenon are possible ?  (4)

       (b) Why is it more appropriate to call zero group elements as noble  gases instead of inert gases?                                                                                                                                           (1) 

 

SECTION- B

Q.1 What are the main reasons in delay of the study of Noble gases.

Q.2  How many lone pairs are there in XeO2F2 and XeO3 ?

Q.3 What is de-Broglie relationship for photon and particle ?

Q.4 What are Normalised and Orthonormal function ?

Q.5 What are the main differences between orbit and orbitals?

Q.6 If the uncertainty in position and momentum are equal. Calculate the uncertainty in velocity for an electron?

Q.7 Calculate (a) The de-Broglie wavelength of an electron moving with a velocity of 5.0 x 105 ms-1 and (b) Relative de-Broglie wavelength of an atom of Helium and an atom of oxygen moving with same velocity (h = 6.63 x 10-34 kg m2 sec-1).


NOTE:- Complete your exam within 1:30Hr. Then create a PDF and send it to given E-mail before 12:00PM. It's mandatory to all.

E-mail: simardhaliwal80@gmail.com 


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