1.

Select the element which does not form double bond

Answer»

Nitrogen
Sulphur
SILICON
Phosphorus

Solution :Silicon does not form double bond with itself or with oxygen thus Si-O bonds are MUCH STRONGER than Si-Si and Si-H bond silicon has vacant 3d - ORBITALS in it valence shell due to which it can extand its covalency from FOUR to five and six.


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