Page 274 - Chemistry ICSE Class X
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260 ICSE Chemistry – 10
Q 27. State one relevant observation for the following reaction: [ICSE 2017]
(i) Action of concentrated sulphuric acid on hydrated copper sulphate.
Q 28. Write balanced chemical equations to show: [ICSE 2017]
(i) The oxidizing action of conc. sulphuric acid on carbon.
(ii) The behaviour of H SO as an acid when it reacts with Magnesium.
4
2
(iii) The dehydrating property of conc. sulphuric acid with sugar.
Q 29. Write balanced chemical equations to show how SO is converted to sulphuric acid in the Contact process.
3
[ICSE 2017]
Q 30. Choose the correct answer from the options given below:
The catalyst used in the Contact process is:
(A) Copper (B) Iron
(C) Vanadium pentoxide (D) Manganese dioxide [ICSE 2018]
Q 31. Write a balanced chemical equation for the following:
Action of concentrated sulphuric acid on carbon. [ICSE 2018]
Q 32. Which property of sulphuric acid is shown by the reaction of concentrated sulphuric acid with:
(i) Ethanol? (ii) Carbon? [ICSE 2018]
Let us say it Again
Sulphuric acid is also known as oil of green vitriol.
The Contact process is commonly employed for the manufacture of sulphuric acid.
In the Contact process
Sulphur dioxide is oxidised to sulphur trioxide by air in the presence of vanadium pentoxide at 450–500°C and 2 atm
pressure.
Sulphur trioxide is then absorbed in conc. H SO to get oleum (H S O ).
4
2 2 7
2
Oleum when diluted with a calculated amount of water gives H SO of the desired concentration.
4
2
Concentrated sulphuric acid
has a very strong affinity for water.
decomposes salts, such as carbonates, nitrates and halides.
is a strong oxidising agent. It oxidises
9 carbon to carbon dioxide
9 sulphur to sulphur dioxide
2+
9 copper to Cu (in sulphate salt)
9 HBr to Br 2
9 H S to S
2
Dilute sulphuric acid
turns blue litmus red
gives out hydrogen gas with metals such as zinc, iron, magnesium and aluminium.
Sulphuric acid is used
for manufacturing fertilizers, ammonium sulphate, superphosphate of lime, hydrochloric acid, nitric acid, sulphates
of metals, alums, etc.
in the preparation of dyes, drugs and disinfectants.
for cleansing metal surface before coating them with enamel paint, tin, zinc (galvanisation).
for the manufacture of pigments and explosives.
as a dehydrating agent.
