The main element used in the vulcanisation of rubber is
In vulcanisation, cruder rubber is heated with 3% sulphur at about for 2-3 hours. Vulcanised rubber is a vastly improved product.
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is
So formula of compound is
The degree of dissociation () of a weak electrolyte, is related to van't Hoff factor (i) by the expression:
Total Moles =
Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of :
The structure of is
Hybridisation of iodine is
So, structure is pentagonal bipyramid.
The outer electron configuration of Gd (Atomic No : 64) is
Answer : 1