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प्रश्न
Give reasons for the following:
A piece of wood becomes black when concentrated sulphuric acid is poured on it.
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उत्तर
A piece of wood becomes black because carbon is set free when cellulose [C6H10O5]n gets charred by conc. H2SO4.
\[\ce{[C6H10O5]_n ->[conc. H2SO4] 6[C]_n + 5[H2O]_n}\]
संबंधित प्रश्न
Comment, sulphuric acid is referred to as oil of vitriol.
How does sulphuric acid occur in nature?
Give reason for the following:
Concentrated sulphuric acid must be stored in airtight bottles.
How are the following conversion brought about? Give equation and condition:
Aqueous barium chloride to barium sulphate.
Name two other acids other than sulphuric acid, which can be prepared by using sulphuric acid.
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.
Name the chemical used to dissolve SO3 and also name the product formed. Give all the main reactions to this process.
Write a balanced chemical equation:
When hot and concentrated sulphuric acid reacts with the sulphur.
Identify the following:
The element having electronic configuration 2, 8, 6.
