Acids Bases and Salts Intex-1 Concise Class-10 ICSE Chemistry Selina Solutions Chapter-3. We Provide Step by Step Answer of Intex-1 Questions of Exercise-3 for ICSE Class-10. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.
Acids Bases and Salts Intex-1 Concise Class-10 ICSE Chemistry Selina Solutions Chapter-3
| Board | ICSE |
| Book / Publication | Concise / Selina |
| Subject | Chemistry |
| Class | 10th |
| Writer | Dr SP Singh |
| Chapter-3 | Acids Bases and Salts |
| Topics | Intex-1 |
| Edition | 2025-2026 |
Intex-1 Questions on Acids Bases and Salts
Page-43
Que-1:
(a) What do you understand by the term, acid?
(b) Name the positive ion formed when an acid is dissolved in water.
(c) Draw the structure of this ion.
Ans:
(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+
Que-2: Write the ionisation reaction of sulphuric acid showing the formation of hydronium ion.
Ans:
H2SO4 + H2O ⇌ H3O+ + HSO4-
HSO4- + H2O ⇌ H3O+ + SO4-2
Que-3: Water is never added to acid in order to dilute it. Why?
Ans: 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.
Que-4: Define the term ‘basicity’ of an acid. Give the basicity of: nitric acid, sulphuric acid, phosphoric acid?
Ans: 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
Que-5: Give two examples of each of the following:
(a) Oxy-acid
(b) Hydracid
(c) Tribasic acid
(d) Dibasic acid
Ans:
(a) Oxyacids: – HNO3, H2SO4
(b) Hydracid:- HCl, HBr
(c) Tribasic acid:- H3PO4, H3PO3
(d) Dibasic acid: – H2SO4 , H2CO3
(a) Oxy-acid
(b) Hydracid
(c) Tribasic acid
(d) Dibasic acid
Que-6: Name the:
(a) acidic anhydride of the following acids:
(i) Sulphurous acid
(ii) Nitric acid
(iii) Phosphoric acid
(iv) Carbonic acid
(b) Acids present in vinegar, grapes and lemon?
Ans:
(a) Below are the acidic anhydride of the given acids:
(i) Sulphurous acid — SO2
(ii) Nitric acid — N2O5
(iii) Phosphoric acid — P2O5
(iv)C arbonic acid — CO2
(b) Acids present in following are:
Vinegar — Acetic acid
Grapes — Tartaric acid
Lemon — Citric acid
Que-7: What do you understand by the statement ‘acetic acid is a mono basic’ acid?
Ans: Acetic acid is a mono basic acid which on ionization in water produce one hydronium ion per molecule of the acid.
Que-8: Give a balanced equation for (i) reaction of nitrogen dioxide with water (ii) Preparation of non-volatile acid from a volatile acid.
Ans:
(i) 2NO2(g) + H2O(l)→ HNO2(aq) + HNO3
(ii) H2S2O7 + H2O → 2 H2SO4
Que-9: What do you understand by the strength of acid? On which factors does the strength of an acid depend?
Ans: The strength of an acid is the extent to which the acid ionizes or dissociates in water.
The strength of an acid depends on the degree of ionization and concentration of hydronium ions [H3O+] produced by that acid in aqueous solution.
Que-10: Explain the following:
(a) Carbonic acid gives an acid salt but hydrochloric acid does not.
(b) Dil. HCl acid is stronger than highly concentrated acetic acid.
(c) H3PO3 is not a tribasic acid.
(d) Lead carbonate does not react with dil. HCl
(e) Nitrogen dioxide is a double acid anhydride.
Ans:
(a) Carbonic acid is a dibasic acid i.e., it has two replaceable hydrogen ions. Hence, it forms one acid salt or one normal salt. On the other hand, hydrochloric acid is a monobasic acid with one replaceable hydrogen ion. Hence, it forms only one normal salt.
(b) Concentration of an acid means the amount of water present in the acid and not at all the strength of an acid. Strength of an acid is the measure of concentration of hydronium ions it produces in its aqueous solution. Thus, dil. HCl is stronger acid than highly concentrated acetic acid.
(c) H3PO3 is not a tribasic acid but dibasic because in oxyacids of phosphorus, hydrogen atoms which are attached to oxygen atoms are replaceable. Hydrogen atoms directly bonded to phosphorus atoms are not replaceable.
(d) Generally, acids liberate carbon dioxide on reaction with metallic carbonates and bicarbonates. But if the salt produced is insoluble, then the reaction does not proceed. So, we do not expect lead carbonate to react with hydrochloric acid.
(e) Nitrogen dioxide is called double acid anhydride because two acids – nitrous acid and nitric acid – are formed when it reacts with water.
2NO2 + H2O ⟶ HNO2 + HNO3
Que-11: How is an acid prepared from a (a) non-metal (b) salt? Give an equation for each.
Ans: (a) Acids are prepared from non-metals by their oxidation. For example :
Sulphur or phosphorus is oxidized by conc. Nitric acid to form sulphuric acid or phosphoric acid.
(b) Acids are prepared from salt by the displacement reaction. For example :
Nitric acid is prepared by using H2SO4 and sodium chloride.
Que-12: Give an equation to show how the following are made from their corresponding anhydrides.
(a) sulphurous acid
(b) phosphoric acid
(c) carbonic acid
(d) sulphuric acid
Ans:
(a) SO2 + H2O ⟶ H2SO3
(b) P2O5 + 3H2O ⟶ 2H3PO4
(c) CO2 + H2O ⟶ H2CO3
(d) SO3 + H2O ⟶ H2SO4
Que-13: Name an acid used:
(a) to flavour and preserve food;
(b) in a drink
(c) to remove ink spots
(d) as an eyewash.
Ans:
(a) Citric acid
(b) Carbonic acid
(c) Oxalic acid
(d) Boric acid
Que-14: Give the reaction of acids with
(a) chlorides
(b) nitrates
State the conditions under which they react.
Ans:
(a) Chlorides react with concentrated sulphuric acid on warming to liberate hydrogen chloride.
(b) Nitrates when heated with conc. sulphuric acid produce more volatile nitric acid.
Both chlorides and nitrates do not react with dilute acids; they react with concentrated acids.
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Please 2020 book solutions for only exercise chemistry
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