Explain me...

the trend changes on going down the group and here the electronegative factor and inductive effect factor decreases so dominance factor is here EN AND -I not steric repulsions

see when electronegativity is more then it tends to withdraw electron towards itself so - I effect increases and repulsion becomes more

got shraddha

see, what happens over here is : in case of NH3+ the bond angle will be less as compared to that in NR3+ due to bulky nature of R group the repulsions increases in turn which incre...

hope this much helps you shraddha🙏