Why is:
(a) Concentrated sulphuric acid kept in air-tight bottles?

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Solution

Concentrated sulphuric acid is a hygroscopic substance that absorbs moisture when exposed to air. Hence, it is stored in air-tight bottles.

Additional Information: Hygroscopy is the phenomenon of attracting and holding water molecules via either absorption or adsorption from the surrounding environment.

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Why is :

(a) concentrated sulphuric acid kept in air tight bottles ?

(b) $H_{2} S O_{4}$ is not used as a drying agent for $H_{2} S$ ?

Give reason for the following:
Concentrated sulphuric acid is kept in airtight bottles.

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 is concentrated sulphuric acid kept in air tight bottles?

Q. (a) When carbon is heating with concentrated sulphuric acid, carbon dioxide is formed. Why?
(b) Why the wooden shelves on which concentrated sulphuric acid bottles are kept are stained black? [4 MARKS]

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Why is: (a) Concentrated sulphuric acid kept in air-tight bottles?

Why is:
(a) Concentrated sulphuric acid kept in air-tight bottles?