Question

in which of the following bond angle is maximum
a.NH3
b.NH4+
c.PCl3
d.SCl2

Answer 1

here is your answer
b) NH4+
It has maximum bond angle as all others have 1 lone pair in their structure so repulsive forces increase but NH4+ don't have any lone pair so it has maximum bond angle.

hope it is useful !!

Answer 2

(d) In NH4+ the bond angle will be maximum.