By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution

By adding 1 ml of orthotolidine solution to 100 ml chlorinated water t

1.	By adding 1 ml of orthotolidine solution to 100 ml chlorinated water taken after contact period, the residual chlorine makes the colour of solution
A.	yellowish
B.	greenish
C.	bluish
D.	reddish
Answer» B. greenish