Question

boajho paheli and their friend golu were provided with a test tube each containg china rose solution which was pink in colour. boajho added two drops of solutions A in his test tube and got dark pink colour. paheli added two drops of solutions B to her test tube and got green colour .golu added two drops of a solution C but could not got any changes in a colour . what would be the possible reason for the variation and identify A,B,C

Answer 1

For solution A, the china rose indicator turns dark pink or magenta. the solution A must be acidic solution as acids turn china rose indicator dark pink.
on adding solution B to china rose indicator, it turns green. this shows that solution B must be basic solution as bases turns china rose green.
when solution C is added to the china rose indicator, it remains unchanged. it must be neutral solution as neutrals do not change color of china rose indicator.
the reason for the variations of color in different test tubes is that because different types of solution A,B and C are added which are different in nature.