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The statements:(1) In filling a group of orbitals of equal energy, it is energetically preferable to assign electrons to empty orbitals rather than pair them into a particular orbital.(2) When two electrons are placed in two different orbitals, energy is lower if the spins are parallel.are valid for
(1) Aufbau principle
(2) Hund's rule
(3) Pauli's exclusion principle
(4) Uncertainty principle
Ans: Hund's rule
Discuss about the different types of stones used for the construction and how to determine the good quality stone?
A 200g golf ball is moving with a speed of 5 m per hour. The associated wave length (h = 6.625 x 10 -34 J sec)is: (1) 10- 1 0 m (2) 10 -20 m
anomalous behaviour of beryllium
show the mechanism
Cathode rays have
define
Explain the steps involved in the preparation of either potassium dichromate from sodium chromate or potassium permanganate from manganese dioxide.
write short note on vulcanization?
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why is density of interstitial compounds less than that of parent metal ?
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