Chemistry-1997-Set II

Q 1 What values are permitted for the magnatic quantum number, m for for an electron with angular momentum number, l=2 ?
Ans. 1 When l=2 m=-2 , -1 , 0 , +1 , +2.

Q 3 Name the metal ion with tripositive charge represented by the configuration 1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 3d(6).
Ans. 2 Chromium (Cr)

Q 4 How is the unit of molar conductivity arrived at ?
Ans. Molar conductivity (m) = K x 1000 / Cm (m) = ohm-1cm-1 / moles/cm3

Q 5 Which one among the following is strongest oxidising agent : ClO4-, BrO4-, IO4-.
Ans. BrO4-

Q 11 Calculate the kinetic energy of moving electron which have wavelength of 4.8 pm. (Mass of electron = 9.11 x 10-31 kg, h = 6.63 x 10-34Js)
Ans. 5 = 4.8 pm = 4.8 x 10-12 m
= h / mv
v = 6.6 x 10-34 Js / 9.1 x 10-31 Kg x 4.8 x 10-12m
= 6.6 x 109 / 9.1 x 4.8
= 0.151 x 109 m/s
= 1.151 x 108 m/s
K.E. = 1/2 mv2
= 1/2 x 9.1 x 10-31 x (1.51 x 108)2
= 1/2 x 20.74 x 1015
= 10.37 x 1015 J

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