MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Aluminium and Its Compounds

Graphite is soft while diamond is hard because

A.PbX2 < SnX2 < GeX2 < SiX2

B.GeX2 < SiX2 < SnX2 < PbX2

C.SiX2 < GeX2 < PbX2 < SnX2

D.SiX2 < GeX2 < SnX2 < PbX2.✓ Correct

Explanation

The bottom elements of group 14 show the inert pair effect. Due to this inert pair effect, the oxidation state of the bottom elements reduces by 2. Therefore, the bottom elements show a stable +2 oxidation state. In the case of dihalides, the oxidation states of the group 14 elements are +2. Therefore, considering the inert pair effect the order of stability is, 2 2 2 2 SiX GeX SnX PbX < < <

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