1.

. Explain:i. Boron is unable to form BF6 ion.ii. [SiF is known whereas [SiCle] not known.ii. Cone. HNO, can be stored in aluminium container.

Answer»

1. Beyond this value,boronwill become unstable and not be able toform BF6 3-ions.

Boronis a non-metallic element. It is electron-deficient. It does not possess d orbitals in its valence shell.

ii. The main reasons are;due to smaller size of F as compared to Cl , six smallF atoms can be easily accommodated around si atom while cl cannot since f are present in smaller 2p orbital and cl are present in larger 3p orbital therefore interaction of f lone pair electron with d orbitals of silicon are stronger in f ascompared cl

Nitric acid reacts with aluminium andformsa protective layer i.e. Al2O3. This protective layer makes aluminium unreactive towards HNO3 and therefore, it can be stored in aluminium containers.



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