Q57 of 270 Page 82

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?

(a) pH 5.5 indicates that potatoes grow better in acidic soil.

(b) Adding lime to this soil will increase the pH of the soil by making it alkaline. Hence broccoli grow better in alkaline soil.



More from this chapter

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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.

 56 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?

 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).

 59 Solution A turns universal indicator blue to purple whereas solution B turns universal indicator orange to red.

(a) What will be the action of solution A on litmus?


(b) What will be action of solution B on litmus?


(c) Name any two substances which can give solutions like A.


(d) Name any two substances which can give solutions like B.


(e) What sort of reaction takes place when solution A reacts with solution B?