ICSE-X-Chemistry
03: Acids, Bases and Salts
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- #Chapter 3 Acids, Bases and Salts Class 10 Selina Chemistry
Intext Question 1
- #Section : A
- Qstn #1What do you understand by the terms, acid and base?Ans : 1
(a) Acids are defined as compounds which contain one or more hydrogen atoms, and when dissolved in water, they produce hydronium ions (H3O+), the only positively charged ions.
(b) Hydronium ion
(c) H3O+
- Qstn #2Explain the formation of hydronium ion. Write the ionization of sulphuric acid showing the formation of hydronium ion.Ans : 2 Hydronium ions: They are formed by the reaction of H+ (from acid) and water. It reacts with water to form H3O+ (Hydronium ion).
H+ + H2O — H3O+
Ionization of sulphuric acid showing the formation of hydronium ion:
- Qstn #3Water is never added to acid in order to dilute it why?Ans : 3 If water is added to a concentrated acid, the heat generated causes the mixture to splash out and cause severe burns. Thus, water is never added to acid in order to dilute it.
- Qstn #4Define the term basicity' of an acid. Give the basicity of nitric acid, sulphuric acid and phosphoric acid.Ans : 4 Basicity: The basicity of an acid is defined as the number of hydronium ions (H3O+) that can be produced by the ionization of one molecule of that acid in aqueous solution.
The basicity of following compounds are:
Nitric acid: Basicity = 1
Sulphuric acid: Basicity = 2
Phosphoric acid: Basicity = 3
- #5-aoxy-acidAns : Oxyacids: HNO3, H2SO4
- #5-bhydracidsAns : Hydracid:- HCI, HBr
- #5-cmonobasic acidAns : Monobasic acid: HCI, HBr
- #5-ddibasic acidAns : Dibasic acid: H2SO4, H2CO3
- #5-etribasic acidAns : Tribasic acid: H3PO4, H3PO3
- #6-aacidic anhydride of the following acids:Ans : The anhydride of following acids are:
- #6-a-isulphurous acidAns : Sulphurous acid: SO2