Give reason:(i) PBCl2 is more stable than PbCl4.(ii) [SiF6]2− is kn

1.	Give reason:(i) PBCl2 is more stable than PbCl4.(ii) [SiF6]2− is known whereas [SiCl6]2− not.
Answer» (i) Apply Fajan's rule, greater the charge on cation more is the polarising power and hence more will be covalent character. Polarising power of Pb⁴⁺ > Pb²⁻ thus PbCl₂ is more covalent than PbCl₄, so it is more stable than PbCl₄. (ii) The size of fluorine is small therefore can be easily arranged around silicon to form [SiF₆ ]²⁻ while the size of chlorine is large enough which create steric hindrance to each other therefore cannot be arranged around silicon in excess.

Give reason:(i) PBCl2 is more stable than PbCl4.(ii) [SiF6]2− is known whereas [SiCl6]2− not.

Answer»

(i) Apply Fajan's rule, greater the charge on cation more is the polarising power and hence more will be covalent character. Polarising power of Pb⁴⁺ > Pb²⁻ thus PbCl₂ is more covalent than PbCl₄, so it is more stable than PbCl₄.

(ii) The size of fluorine is small therefore can be easily arranged around silicon to form [SiF₆ ]²⁻ while the size of chlorine is large enough which create steric hindrance to each other therefore cannot be arranged around silicon in excess.

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Give reason:(i) PBCl2 is more stable than PbCl4.(ii) [SiF6]2− is known whereas [SiCl6]2− not.

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