Sulphur on reaction with concentrated sulphuric acid forms sulphur dioxide. According to this reaction, sulphuric acid is behaving as:

drying agent

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oxidising agent

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dehydrating agent

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none of these

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Solution

The correct option is A oxidising agent
Hot concentrated sulfuric acid oxidizes non metal such as carbon and sulfur.

$S + 2 H_{2} {S O}_{4} \to 3 {S O}_{2} + 2 H_{2} O$

Option B is correct.

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Similar questions

Describe the reactions that show
(i) Concentrated sulphuric acid is a non-volatile acid.
(ii) Concentrated sulphuric acid acts as a dehydrating agent.
(iii) Concentrated sulphuric acid is an oxidising agent.
(iv) Dilute sulphuric acid behaves as dibasic acid.

Sulphur oxidises sulphuric acid to sulphur dioxide.

When ethanol is heated with concentrated sulphuric acid at $170^{\circ} C,$ it gets converted into ethene. In this reaction, concentrated sulphuric acid acts as :
(a) oxidising agent (b) catalyst (c) dehydrating agent (d) reducing agent

Give reasons for the following:
(i) In the contact process, sulphur trioxide formed is dissolved in 98% sulphuric acid and not in water.
(ii) When solution of sulphur dioxide is exposed to air, it gets converted to sulphuric acid.
(iii) When diluting concentrated sulphuric acid, the acid should be added to water and not water to the acid.
(iv) When concentrated sulphuric acid is exposed to air, its volume increases and it becomes slightly dilute.
(v) Sulphuric acid can form two kinds of salts with sodium chloride.
(vi) When barium chloride is added to dilute sulphuric acid, a white precipitate is formed.
(vii) When carbon is heated with concentrated sulphuric acid, carbon dioxide is formed.
(viii) Ammonia gas cannot be dried by passing through concentrated sulphuric acid.
(ix) When concentrated sulphuric acid is added to sugar/glucose, a black mass is left behind.
(x) Concentrated sulphuric acid should not be added to oxalic acid or formic acid in the open laboratory.
(xi) When concentrated sulphuric acid is added to blue crystalline copper sulphate, it turns powdery white.
(xii) Concentrated sulphuric acid must be stored in airtight bottles.
(xiii) Cotton clothes get burnt with concentrated sulphuric acid.
(xiv) H₂SO₄ cannot be prepared by heating sodium sulphate with conc. HCl or HNO₃.

Q. Why does sulphur on reacting with concentrated nitric acid gives sulphuric acid instead of sulphur dioxide?

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Sulphur on reaction with concentrated sulphuric acid forms sulphur dioxide. According to this reaction, sulphuric acid is behaving as:

The correct option is A oxidising agentHot concentrated sulfuric acid oxidizes non metal such as carbon and sulfur.S+2H2SO4→3SO2+2H2OOption B is correct.

The correct option is A oxidising agent
Hot concentrated sulfuric acid oxidizes non metal such as carbon and sulfur.

$S + 2 H_{2} {S O}_{4} \to 3 {S O}_{2} + 2 H_{2} O$

Option B is correct.