Chemistry - Complete P-block Question with Solution | TestHub
These questions contains, Statement I (assertion) and Statement II (reason).
Statement-1 : Sulphur exhibits paramagnetic behaviour in vapour state.
Statement-2 : In vapour state sulphur partly exists as S2 molecule which has two unpaired electrons in antibonding π* orbitals.
Options:
Answer:
Solution:
Question Explanation:
This assertion-reasoning question explores the magnetic properties of sulphur when it is heated into its vapour state.
Concept:
The magnetic properties of a molecule are determined by the presence or absence of unpaired electrons in its molecular orbitals, according to Molecular Orbital Theory (MOT).
Solution:
Statement-1 (Assertion): Sulphur exhibits paramagnetic behavior in the vapour state. This is True because at high temperatures (around 1000 K ), sulphur exists partly as S2 molecules.
Statement-2 (Reason): Similar to O2 , the S2 molecule has two unpaired electrons. These electrons reside in the antibonding π* (pi-star) orbitals. This is True and directly explains why the vapour is paramagnetic.
Conclusion: Since the presence of S2 with unpaired electrons is the reason for the paramagnetic behavior, Statement-2 is the correct explanation for Statement-1.