Q56 of 270 Page 82

The pH values of five solutions A, B, C, D and E are given below:


Which solution is (i) weakly alkaline (ii) neutral (iii) strongly acidic (iv) strongly alkaline, and (v) weakly acidic?

(i) weakly alkaline-D (ii) neutral-C (iii) strongly acidic-A (iv) strongly alkaline-E (v) weakly acidic-B.

Explanation- If pH lies between 0-7, then it is acidic solution. If pH is 7, then it is a neutral solution. If pH lies between 7-14, then it is alkaline solution.



More from this chapter

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54 A milkman adds a very small amount of baking soda to fresh milk.

(a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?


(b) Why does this milk take a long time to set as curd?

 55 Which of the following elements would form oxides which would indicate pH values less than seven, using moist pH paper?

Magnesium, Carbon, Sulphur, Hydrogen, Copper.

 57 Potatoes grow well on Anhad's farm which has soil with a pH of 5.5. Anhad decides to add lot of lime to soil so that he can grow broccoli in the same farm:

(a) Do potatoes grow better in acidic or alkaline soil?


(b) Does broccoli grow better in acidic or alkaline soil?

 58 Here are some results of solutions tested with universal indicator paper Sulphuric acid : Red

Metal polish : Dark blue


Washing-up liquid : Yellow


Milk of magnesia : Light blue


Oven cleaner : Purple


Car battery acid : Pink


Arrange the solutions in order of their increasing pH values (starting with the one with the lowest pH).