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How would you account for the following:...

How would you account for the following:
`XeF_2` is a linear molecule without a bend.

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` XeF_2`, in fact is a trigonal bipyramidal molecule, with three equitorial positions being occupied by lone pair of electrons and two fluorine atoms occupying axial position. This is to reduce the repulsions between the lone pairs and bond pairs. The structure is given below :
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(a) (i) Complete the following chemical equations : (i) NaOH_((aq))+Cl_(2(g)) rightarrow (Hot and conc.) (ii) Xef_(6)(s)+H_(2)O(l) rightarrow (b) How would you account for the following ? (i) The value of electron gain enthalpy with negative sign for sulphur is higher than that for oxygen. (ii) NF_(3) is an exothermic compound but NCl_(3) is endothermic compound. (iii) ClF_(3) molecule has a T-shaped structure and not a trigonal planar one.

Explain the following : (a) The electron gain enthalpy with negative sign for fluorine is less than for chlorine, still fluorine is a stronger oxidising agent than chlorine. (b) XeF_(2) is linear molecule without a bend. (c) NCl_(3) is an endothermic compound while NF_(3) is an exothermic one.

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