Sulphuric Acid Intex Concise Class-10 ICSE Chemistry Selina Solutions Chapter-11. We Provide Step by Step Answer of Intex Questions of Exercise-11 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.
Sulphuric Acid Intex Concise Class-10 ICSE Chemistry Selina Solutions Chapter-11
| Board | ICSE |
| Book / Publication | Concise / Selina |
| Subject | Chemistry |
| Class | 10th |
| Writer | Dr SP Singh |
| Chapter-11 | Study of Compounds – Sulphuric Acid |
| Topics | Intex |
| Edition | 2025-2026 |
Intex on Sulphuric Acid
Page-180
Que-1: Comment, sulphuric acid is referred to as
(a) King of chemicals
(b) Oil of vitriol
Ans:
(a) Sulphuric acid is called King of Chemicals because there is no other manufactured compound which is used by such a large number of key industries.
(b) Sulphuric acid is referred to as Oil of vitriol as it was obtained as an oily viscous liquid by heating crystals of green vitriol.
Que-2: Sulphuric acid is manufactured by contact process
(a) Give two balanced equations to obtain SO2 in this process.
(b) Give the conditions for the oxidation of SO2
(c) Name the catalyst used.
(d) Why H2SO4 is not obtained by directly reacting SO3 with water.
(e) Name the chemical used to dissolve SO3 and also name the product formed.
(f) Name a gas that can be oxidized to sulphur.
Ans: (a) Two balanced equations to obtain SO2 is:
(i) 4FeS2 + 11O2 2Fe2O3 +8SO2
(ii) S +O2 SO2
(b) The conditions for the oxidation of SO2 are:
(i) The temperature should be as low as possible. The yield has been found to be maximum at about 4100C-450oC
(ii) High pressure (2 atm) is favoured because the product formed has less volume than reactant.
(iii) Excess of oxygen increases the production of sulphur trioxide.
(iv) Vanadium pentoxide or platinised asbestos is used as catalyst.
(c) Vanadium pentoxide (V2O5)
(d) Sulphuric acid is not obtained directly by reacting SO3 with water because the reaction is highly exothermic which produce the fine misty droplets of sulphuric acid that is not directly absorbed by water.
(e)The chemical used to dissolve SO3 is concentrated sulphuric acid. The product formed is oleum.
(f) Hydrogen sulphide.
Que-3: Why the impurity of arsenic oxide must be removed before passing the mixture of SO2 and air through the catalytic chamber?
Ans: Impurity of ARSENIC poisons the catalyst [i.e. deactivates the catalyst]. So, it must be removed before passing the mixture of SO2 air through the catalytic chamber.
Que-4:
(a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(b) In the contact process for the manufacture of sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two -steps procedure is used. Write the equations for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite in step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
Ans:
(a) The catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C is Vanadium pentoxide.
(b) The two steps for the conversion of sulphur trioxide to sulphuric acid is:
(i) SO3 + H2SO4H2S2O7
(ii) H2S2O7 + H2O 2H2SO4
(c)The substance that will liberate sulphur dioxide in step E is dilute H2SO4.
(d) The equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F is:
SO2+2NaOHNa2SO3+H2O
Or
Na2O+SO2Na2SO3
—: End of Study of Compounds – Sulphuric Acid Intex Concise Class-10 ICSE Chemistry Selina Solutions : –
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1 thought on “Sulphuric Acid Intex Concise Class-10 ICSE Chemistry Selina Solutions”
2015 c ii) is wrong