Q58 of 270 Page 82

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).

Sulphuric acid(Acidic) < Car battery acid(Acidic) < Washing-up liquid(Slightly acidic) < Milk of magnesia(Basic) < Metal polish(Basic)< Oven cleaner(Basic).

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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?

 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?

 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?

 60 A first-aid manual suggests that vinegar should be used to treat wasp stings and baking soda for bee stings.

What does this information tell you about the chemical nature of:


(a) wasp stings?


(b) bee stings?