The test tube I contains sodium bicarbonate solution whereas test tube II contains lemon juice. On introducing pH paper strips in both the solutions, it is observed that the pH paper turns:

Test tube 'P' contain NaHCO_3 solution. Test tube 'Q' contain lemon juice. On introducing pH paper strips on both of them it is observed that the pH paper turns.

A student was given three samples containing hydrochloric acid, sodium bicarbonate solution and water in test tubes I, II and III respectively. On dipping a pH paper in them he observed that the colour turned orange in I, blue in II, and green in III. If arranged in increasing order of their pH it would be

Test tube (A) contains aqueous zinc acetate solution while test tube (B) contains aq, zinc chloride solution .What happens if H_(2)S gas is passed into each solution ?

On dipping a pH paper in a solution , it turns into yellow , then the solution is basic .

Priyanka introduced an iron nail in a test-tube containing freshly prepared copper sulphate solution. What would she observe?