Chlorine (Cl2) bleaches a substance permanently because it is due to oxidation but sulphure dioxide (SO2) does it temporarily because it is due to reduction.
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Sunday, February 23, 2020
Why Noble gases are mostly chemically inert?
The inertness to chemical reactivity of noble gases is attributed to the following reasons:
(1)The noble gases except helium (1s2) have completely filled ns2np6 electronic configuration in their valence shell.
(2) They have high ionisation enthalpy and more positive electron gain enthalpy.
Why Xenone (Xe) does not forms compounds such as xenone trifluoride (XeF3)and xenone pentafluoride (XeF5)?
By the promotion of one, two or three electrons from filled p-orbital to the vacant d-orbital in the valence shell, 2, 4 or 6 half filled orbitals are formed. Thus Xe can combine only with even number of fluorine and not odd.
Why Noble gases exhibit large positive values of electron gainenthalpy?
Since noble gases have stable electronic configurations, they have no tendency to accept the electron and therefore, have large positive values of electron gain enthalpy.
Why Noble gases have very low boiling points?
Noble gases being monoatomic have no interatomic forces except weak dispersion forces and therefore, they are liquefied at very low temperatures. Hence, they have low boiling points.
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