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Question
Concentrated sulphuric acid is both an oxidizing agent and a non-volatile acid. Write one equation. Each illustrates the above-mentioned properties of sulphuric acid.
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Solution
- Oxidising agent: Concentrated sulphuric acid as an oxidising agent oxidises carbon to carbon dioxide.
\[\ce{\underset{Carbon}{C} + 2H2HO4 -> \underset{Carbon dioxide}{CO2} + 2SO2 + 2H2O}\] - Non-volatile acid: Concentrated sulphuric acid has a high boiling point (338°C) that is why it is said to be a non-volatile compound; therefore, it is used for preparing volatile acids like hydrochloric acids and nitric acids from their salts by double decomposition.
\[\ce{H2SO4 + NaCl -> NaHSO4 + HCl}\]
RELATED QUESTIONS
Comment, sulphuric acid is referred to as King of chemicals.
Give reason for the following:
Red brown vapours are produced when concentrated sulphuric acid is added to hydrogen bromide.
Give reasons for the following:
Brisk effervescence is seen when oil of vitriol is added to sodium carbonate.
What would you observe in the following case?
Sulphur trioxide is dissolved in water on a large scale.
Give reason for the following:
When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
Choose the current answer from the options given below :
Which of the following gas dissolves in H2SO4 to give alum?
Fill in the blank with appropriate word/words :
Oil of Vitriol is ___________
A, B, C and D summarise the properties of sulphuric acid depending on whether it is dilute or concentrated.
A = Typical acid property
B = Non-Volatile acid
C = Oxidising agent
D = Dehydrating agent
Choose the property (A, B, C or D) depending on which is relevant to each of the following :
(i) Preparation of hydrogen chloride gas
(ii) Preparation of copper sulphate from copper oxide
(iii) Action of cone, sulphuric acid on sulphur
Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reaction (a) to (e). Some properties may be repeated.
A. Acid
B. Dehydrating agent
C. Non-volatile acid
D. Oxidizing agent
(a) \[\ce{C12H22O11 + nH2SO4 -> 12C + 11H2O + nH2SO4}\]
(b) \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\]
(c) \[\ce{NaCl + 2H2SO4 -> NaHSO4 + HCl}\]
(d) \[\ce{CuO + 2H2SO4 -> CuSO4 + H2O}\]
(e) \[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]
Sulphuric acid is manufactured by the contact process.
Why H2SO4 is not obtained by directly reacting SO3 with water?
