Give reason for the following:
Dilute sulphuric acid can not be replaced by concentrated acid in the preparation of hydrogen.

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Solution

Concentrated sulphuric acid is a strong oxidizing agent which produces the sulphur dioxide gas instead of hydrogen.

So, we can not use concentrated sulphuric acid in place of dilute sulphuric acid for the preparation of hydrogen.
That is,

$Z n + 2 H_{2} S O_{4} ⟶ Z n S O_{4} + S O_{2} + 2 H_{2} O$

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Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

Write the equation for:
(a) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(b) the reaction between hydrogen chloride and ammonia.

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) Write the equation for:
(i) the preparation of hydrogen chloride from sodium chloride and sulphuric acid. State whether the sulphuric acid should be concentrated or dilute.
(ii) the preparation of ammonia from ammonium chloride and calcium hydroxide.
(iii) the reaction of hydrogen chloride with ammonia.

Q. Hydrogen can be Prepared from dilute sulphuric acid using zinc but not lead. Give reason

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Neutralisation Reaction

Standard X Chemistry

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Give reason for the following:​ Dilute sulphuric acid can not be replaced by concentrated acid in the preparation of hydrogen. ​

Concentrated sulphuric acid is a strong oxidizing agent which produces the sulphur dioxide gas instead of hydrogen. So, we can not use concentrated sulphuric acid in place of dilute sulphuric acid for the preparation of hydrogen. That is, Zn+2H2SO4⟶ZnSO4+SO2+2H2O

Give reason for the following:
Dilute sulphuric acid can not be replaced by concentrated acid in the preparation of hydrogen.