Q7 of 34 Page 34

Why does distilled water not conduct electricity whereas rain water does?

Distilled water is a pure form of water which does not contain ions, hence distilled water does not conduct electricity. Rain water, being an impure form of water, contains many ionic compounds like acids, hence it conducts electricity.


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5

Write word equations and then balanced equations for the reactions taking place when:

(a) dilute sulphuric acid reacts with zinc granules


(b) dilute hydrochloric acid reacts with magnesium ribbon


(c) dilute sulphuric acid reacts with aluminium powder


(d) dilute hydrochloric acid-reacts with iron filings

 6

Compounds such as alcohol and glucose also contain hydrogen but are not categorized as acids. Why? Describe an activity to prove it.

 8

Why do acids not show acidic behaviour in the absence of water?

 9

Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively.

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


(b) Arrange the pH values in the increasing order of hydrogen ion concentration.