The base of the beaker gets heated when water is added to concentrated sulphuric acid as the reaction is:

Neutralization

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Exothermic

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Endothermic

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Oxidation

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Solution

The correct option is B Exothermic
In exothermic process the base of the beaker in which the reaction is carried out gets heated when water is added to concentrated sulphuric acid due to the increase in dissociation of the acid molecules present in the solution. This is why it is advisable to never put water directly into concentrated acids. Rather the concentrated acid should be poured into water slowly and with constant stirring.

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Similar questions

Q. The beaker gets cold when concentrated sulphuric acid is added to water.

Q. The beaker gets warm when concentrated sulphuric acid is added to water as the process is exothermic.

Q. When ethanol is heated with excess of concentrated sulphuric acid at

170^{o} C

, it gets converted to ethene. In this reaction, concentrated sulphuric acid acts as:

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.

Why concentrated sulphuric acid is added to water and not the water to concentrated sulphuric acid

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