MCQ
Which of the following conversions involves change in both shape and hybridisation?
- A${H_2}O\, \to \,{H_3}{O^ + }$
- ✓$B{F_3}\, \to \,BF_4^ - $
- C$C{H_4}\, \to \,{C_2}{H_6}$
- D$N{H_3}\, \to \,NH_4^ + $

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$2 C ( s )+ H _2( g ) \longrightarrow C _2 H _2( g ) \ \ \ \ \ \Delta H =225 \ kJ mol ^{-1} $
$2 C ( s ) \longrightarrow 2 C ( g )\ \ \ \ \ \ \Delta H =1410 \ kJ mol ^{-1} $
$H _2( g ) \longrightarrow 2 H ( g ) \ \ \ \ \ \ \Delta H =330 \ kJ mol ^{-1}$
(Molar mass of $\mathrm{H}_3 \mathrm{PO}_4=98 \mathrm{~g} \mathrm{~mol}^{-1}$ )
$(K_f =-1.86\,^o\,C/m)$
