NEET Chemistry The p-Block Elements (XII) Questions Solved

BOARD

(a) Draw the molecular structure of following compounds :

(i) XeF6                                            (ii) H2S2O8

(b) Explain the following observations :

(i) The molecules NH3 and NF3 have dipole moments which are of opposite direction.

(ii) All the bonds in PCl5 molecule are not equivalent.

(iii) Sulphur in vapour state exhibits paramagnetism.

(a) (i) XeF6 :

(ii) H2S2O8 :

(b) (i) Because F is more electronegative than N in NF3 whereas N is more electronegative than H in NH3.

(ii) Because PCl5 has a trigonal bipyramidal structure in which the three equatorial P-Cl bonds are equivalent while the two axial bonds are longer than equatorial bonds.

(iii) Because sulphur in vapour state has two unpaired electrons in the antibonding π* orbitals like O2.

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