The hybridisation of the  central  atom will change when: 

(a) NH3 combines with H+

(b) H3BO3combines with OH-

(c) NH3 forms NH2-

(d) H2O combines with H+

Concept Videos :-

#7 | Hybridization in case of Carbon| Intro
#8 | Hybridization in case of Carbon| sp3
#9 | Hybridization in case of Carbon| sp2
#10 | Hybridization in case of Carbon| sp
#11 | Hybridization in case of other Molecules

Concept Questions :-

Hybridisation
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