Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4 , 1 , 11 , 7 and 9, respectively. Which solution is : (a) Neutral? (b) Strongly alkaline? (c) Strongly acidic? (d) Weakly acidic? (e) Weakly alkaline? Arrange the pH in increasing order of hydrogen-ion concentration.

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

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

Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an Activity to prove it.

Write word equations and then balanced equations for the reaction 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.

Which one of the following types of medicines is used for treating indigestion? (a)Antibiotic (b) Analgesic (c) Antacid (d) Antiseptic