Short Answer TypeDefine catenation. How will you explain the tendency for catenation decreases in the order C > Si > Ge > Sn > Pb?
Explain inert pair effect with reference to carbon family.
Or
Explain C and Si are tetravalent, but Ge, Sn and Pb show divalent.
Why silicon does not form an analogue of graphite?
Or
Why elemental silicon does not form graphite like structure as carbon does?
Select the member of group 14 that:
(i) forms the most acidic dioxide
(ii) is commonly found in +2 oxidation state
(iii) is used as semiconductor.
What is allotropy? Enlist the various allotropic forms of carbon.
Allotropy: Allotropes or allotropic forms are defined as the different forms of an element which have different physical but similar chemical properties. The phenomenon of existence of allotropic forms is known as allotropy.
Allotropic forms of carbon:
Carbon exists in two types of allotropic forms:
(i) Crystalline forms: Diamond and graphite.
(ii) Amorphous forms: Coal, coke, charcoal, lamp black.
Give the name of allotrope of carbon which:
(i) is the hardest substance known
(ii) is used by artists in pencils
(iii) has the property of adsorbing gases
(iv) is used for making electrodes
(v) is used for absorbing organic colouring matter.
(vi) is used in the manufacturing of boot polishes.
are known to exist. Give possible reason.
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