Write answers of miscellaneous questions based on ICSE examination
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Answer:
Question 1: Solution A is a strong acid, solution B is a weak acid, solution C is a strong alkali.
(i) Which solution contains solute molecules in addition to water molecules.
(ii) Which solution could be a solution of glacial acetic acid ?
(iii) Give an example of a solution which is a weak alkali.
Answer: (i) B (ii) B (iii) Ammonium hydroxide
Question 2: (i) What is basicity of an acid. Give examples.
(ii) Give the basicity of nitric acid, acetic acid and phosphoric acid.
(iii) State two properties of an acid.
(iv) On what factors the strength of an acid depend ?
(v) Name an acid used : (a) as a flavour and to preserve food (b) in a drink (c) to remove ink spots (d) as an eye wash.
Answer: (i) The number of replaceable hydrogen atoms, present in one molecule of an acid is known as basicity of the acid. For example hydrochloric acid is a monobasic acid, sulphuric acid is a dibasic acid and phosphoric acid is a tribasic acid.
(ii) Nitric acid (HNO3) —> Monobasic
Acetic add (CH3COOH) —> Monobasic
Phosphoric add (H3PO4) —> Tribasic.
(iii) (a) An add turns methyl orange into pink and blue litmus to red.
(b) An add with a base forms salt and water only.
NaOH + HCl —> NaCl + H2O
(alkali) (acid) (Salt) (water)
(iv) The strength of an acid depends on the following :
(a) Reactivity of the acid. (b) Degree of ionisation to H+ ion.
(v) (a) Citric add. (b) Carbonic acid.
(c) Oxalic add. (d) Boric acid.