What happens when concentrated sulphuric acid is added to glucose?

Water is removed from glucose.

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No reaction takes place.

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{SO}_{2}

gas is evolved.

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Solution

The correct option is A Water is removed from glucose.
Concentrated sulphuric acid is a strong dehydrating agent. So when it is added to glucose, it removes the water molecules to form a black-coloured, porous carbon.

The reaction that takes place is represented as:

$C_{6} H_{12} O_{6} (s) conc . H_{2} {SO}_{4} - ------ \to 6 C (s) + 6 H_{2} O (l)$

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Similar questions

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.

What happens when concentrated Sulphuric Acid is added to Sodium Chloride?

Q. What happens when sulphuric acid is diluted by adding water to concentrated

H_{2} S O_{4}

. Explain.

Q. what happens when ethanol is added to butanoic acid in the presence of concentrated sulphuric acid. draw and name the new compound

Q. what will happen if concentrated nitric acid is added to cocentrated sulphuric acid?

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