The type of hybridisation found in NO3- ionis .....................
Sp
Sp2
Sp2 d
Sp3
sir atomic no. of nitrogen is 7 and oxygen is 6
total valence electron =7+3*6=25 charge= -1 so, 25+1=26
then 26/8=3(Q)+2(R)
2/2=1(Q)+0(R) therefore X=4 and hybridisation=sp3