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

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Solution

When concentrated Sulphuric acid ( $H_{2} {SO}_{4}$ ) is added to Sodium chloride, the formation of Sodium Bisulphate and Hydrochloric acid will take place.
In this reaction, concentrated Sulphuric acid acts as a strong oxidizing agent and Chloride ion acts as a weak reducing agent. With the help of a strong acid, protonation of $H^{+}$ ions will take place to form Sodium Bisulphate.
$2 NaCl (s) + conc . H_{2} {SO}_{4} (l) \to {NaHSO}_{4} (aq) + HCl (g) Sodium Sodium Chloride Bisulphate$

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Similar questions

What would you observe in the following cases?
(i) Sulphur trioxide is dissolved in water on a large scale.
(ii) Concentrated sulphuric acid is added to equal volumes of cold water.
(iii) 100 ml of 98% sulphuric acid is kept open.
(iv) Hot concentrated sulphuric acid is added to sodium chloride crystals.
(v) Dilute sulphuric acid is added to ferrous sulphate solution.

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.

(a) State what happens when:
(i) Copper sulphate solution is electrolysed using a platinum anode.
(ii) Excess ammonia is passed through an aqueous solution of lead nitrate.
(iii) Washing soda is left exposed to dry air for long time.
(iv) Silver nitrate solution is added to dil. HCl.
(v) Hot concentrated sulphuric acid is added to sodium chloride crystals.

What do you observe when

(a) dilute sulphuric acid is added to granulated zinc ?

(b) a few pieces of iron are dropped in a blute solution of sodium chloride ?

(d) ferrous sulphate solution is added to an aqueous solution of sodium hydroxide.

(e) solid lead nitrate is heated ?

(f) when dilute sulphuric acid is added to barium chloride solution ?

Q. what happens when sodium chloride and concentrated sulphuric acid are heated?

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