A solution turns red litmus blue, its pH is likely to be
(a) 1 (b) 4 (c) 5 (d) 10
(d) Bases turn red litmus blue and acids turn blue litmus red. Basic solution has a pH value more than 7. Since the solution turns red litmus blue, its pH is likely to be 10.
A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains
(a) NaCl (b) HCl (c) LiCl (d) KCl
(b) The solution contains HCl.
10 mL of a solution of NaOH is found to be completely neutralised by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be
(a) 4 mL (b) 8mL (c) 12 mL (d) 16 mL
Which one of the following types of medicines is used for treating indigestion?
(c) Antacid is used for treating indigestion.
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.
(a) Sulphuric acid + Zinc → Zinc sulphate + Hydrogen
(b) Hydrochloric acid + Magnesium → Magnesium chloride + Hydrogen
(c) Sulphuric acid + Aluminium → Aluminium sulphate + Hydrogen
(d) Hydrochloric acid + Iron → Ferric chloride + Hydrogen
Compounds such as alcohols and glucose also contain hydrogen but are not categorized as acids. Describe an activity to prove it.