Question

1)A student tested the pH of distilled water using pH paper and observed green colour. After adding a few drops of dilute NaOH solution, the pH was tested again. The colour change now observed would be : (a) blue (b) green (c) red (d) orange 2)Four solutions I, II III and IV were given to a student to test their acidic or basic nature by using pH papers. He observed that the colour of pH paper turned to red, blue, green and orange respectively when dipped in four solutions. The correct conclusion made by the student would be (a) I, II and III are acidic. Page 9 of 17 (b) I and IV are acidic. (c) II, III, and IV are acidic. (d) II and IV are acidic

Answer 1

1-blue
2-(b)1 and 4 are acidic