A teacher instructed four students A,S,C and D to prepare a suspension of chalk in water. The students prepared suspension in the following manner:
student ′A′ places a piece of chalk in water.
student ′S′ places powdered chalk in water.
student ′C′ places powdered chalk in water and then shakes the mixture vigorously.
student ′D′ places powdered chalk in dil. HCl.
Which of the following students has correct way of preparation of suspension?
