Imli doesn't want to kill Chakor but only to test Sooraj's loyalty.
So she knowingly give gun without bullets and RV knows it too that gun had no bullets.
But like always,he overconfident that Sooraj will not shoot Chakor and truth will come out.
And RV already give promise to Imli that he will not try to kill Chakor till elections.
So he only want to prove Sooraj's truth to Imli.
And only thing Chakor unaware of everything.
In a way,it's good Chakor reacted naturally so Imli fully convinced.
So Sooraj able to outplay RV well.
But now it's going to be difficult for Sooraj to convince Chakor because she going to be mad at him as she never thought of such a thing from him after regaining his memory.