Which of the following statement is INCORRECT?
(a). `(e)/(m)` ratio for canal rays is maximum for hydrogen ion.
(b). `(e)/(m)` ratio for cathode rays is independent of the gas taken.
(c). The nature of canal rays is dependent on the electrode material.
(d). The `(e)/(m)` ratio for electron is expressed as `(E^(2))/(2B^(2)V)`, when the cathode rays go undeflected under the influence of electric field `(E)`, magnetic field `(B)` and `V` is potential difference applied across electrodes.

Options

A. The coordination number of each type of ion in CsCl crystal is 8.
B. A metal that crystallizes in bcc structure has a coordintaion number of 12.
C. A unit cell of an ionic crystal shares some of its with other unit cells
D. The length of the unit cell in NaCl is 552 pm `(r _(Na^(+))=95 pm , r_(Cl^(-)) = 181 pm ).`

Answer

B