Which of the following is not an allotropic form of carbon? - | Shaalaa.com

A metal exists in two allotropic forms. α− form is BCC and β-fo... | Filo

Boron exists in different allotropic forms. All allotropic form contains icosahedral units (icosahedral is a regular shape with 12 corners and 20 faces) with boron atoms at all 12 corners and all bonds are equivalent. Calculate the heat evolved at constant pressure (in kJ / mole ) of boron atom undergoing the above change if the bond dissociation enthalpy of B-B bond is 300  kJ / mol. (a) 500 (b) 750 (c) 1500 (d) 900 | Numerade