The pH of a cold drink is 5. What will be its action on blue and red litmus solutions?

26 (a) The pH values of six solutions A to F are given below :

A = 0, B = 11, C = 6, D = 3, E = 13, F = 8

Which of the above solutions are

(i) acids

(ii) alkalis?

26 Name the acids or alkalis used to make (i) car batteries (ii) explosives (iii) soaps (iv) fertilizers. 27 The pH values of three acids A, B and having equal molar concentrations are 5.0, 2.8 and 3.5 respectively.

Arrange these acids in order of the increasing acid strengths.

28 Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?