# 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