1.Bottle A contains a dilute solution of vinegar and bottle B Contains sodium carbonate solution. The colour seen in pH paper dipped in A and B are _________and____________

2. A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the samples taken was not proper.The teacher was referring to-

a. dilute hydrochloric acid b.lemon juice c.washing soda d. soap solution