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C and Si are always tetravelent , but Ge...

`C` and `Si` are always tetravelent , but Ge, Sn and Pb show divalency Gvie reason .

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Anong forup `14` elements `C` and `Si` have noble gas caore heneath the valence shell electrons wherwseas in `Ga, Sn` and `Pb` fully filled lesser shielding `d` and (or) f-orbitals are present in-=between the noble gas coare and valence shell electron . As a result inerst pair effect is exhibited by Ga, Sn and Pb and not ny `C` and `Si`. Hence `C` and (are alwyas tentravelent but `1` Ga Sn and Pb are always divlent in nature .
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CENGAGE CHEMISTRY-P-BLOCK GROUP 14 - CARBON FAMILY-Ex (Subjective)
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  2. Why carbon froms covalent compounds whereas lead forms ionic compounds...

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  6. Give one chaemical reaction to explain why time (II) chloride is a red...

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  7. C and Si are always tetravelent , but Ge, Sn and Pb show divalency Gvi...

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  8. Tendency to exhibit +2 oxidation state increases with increasing atom...

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  9. Why trimethylamine si pyramidal but trisiluylamine is planar ?

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  10. (CH3)3N acts as a Lewis base , but (SiH3)3 have very little baklsic ch...

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  11. CO is stable , but analogous SiO is not stable . Why ?

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  12. Why PbX2 is more stable than PbX4?.

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  13. PbO2 acts as a stronger oxidising agent than SnO2. Cmment .

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  14. Give reason : CO is readily absorbed by ammonitcal cuprous chloride , ...

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  15. Silanes are feq in mumber whereas alkances are large in muimber . Expl...

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  16. Are (CH3)3N and (SiH3)3N siostructurel , Justify uour answer .

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  17. For a mineral . liAl (SiO3)2, what is the charge on SiO3 unit ? What i...

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  18. A metal M forms two chlofrodes M Cl2 and MCl4 respectively . In which ...

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