question_answer

Rahul takes 2 mL of milk in a test-tube. He first add a little dilute sodium hydroxide solution into it and then 3 drops of copper sulphate solution. He shakes the test-tube for a while and finds:

A) colour of the solution turned black

B) colour of the solution turned violet

C) colour of the solution turned yellow

D) colour of the solution turned green

E) None of these