Which statement is not correct about fullerene C60 ?
It contains 20 six membered rings and 12 five membered rings
All carbon atoms undergo sp2 hybridisation
A six membered ring is fused with six membered rings only
A five membered ring is fused with six membered ring only
Which is the most stable allotrope of sulphur?
Octahedral sulphur
Monoclinic sulphur
Plastic sulphur
Colloidal sulphur
Select the most appropriate statement In BF3.
All the bonds are completely ionic.
All the bonds are covalent.
The B-F bond is partially ionic.
B-F bond has partial double bond character.
B.
All the bonds are covalent.
BF3 is a covalent compound. Boron or B has 3 valency electrons with number d-orbital whereas Fluorine or F has 7 valency electrons with number d-orbital.
Thus, it will form 3 covalent bonds with 3 fluorine atoms to complete its octate and give a stable BF3 compound.
Therefore, BF3 is a covalent compound.
The correct formula of borax is
Na2[B4O4(OH)3].9H2O
Na2[B4O5(OH)4].8H2O
Na2[B4O6(OH)5].7H2O
Na2[B4O7(OH)6].6H2O
Which carbon is more electronegative ?
sp3 - hybridised carbon
sp - hybridised carbon
sp2 - hybridised carbon
Always same irrespective of its hybrid state