Write balanced chemical equation for the reaction between zinc and dilute sulphuric acid.
(i) What is the purpose of the contact process?
(ii) Name the catalyst used in the contact process.
(iii) Write the balanced equation for the reaction in the contact process, which takes place in the presence of catalyst.

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Solution

The balanced chemical reaction between zinc and dilute sulphuric acid is:

Zn + H₂SO₄ → ZnSO₄ + H₂

(i)The purpose of the contact process is to produce sulphuric acid in large quantities and at an economical rate.
(ii) Platinum or vanadium pentaoxide is commonly used as the catalyst in the contact process.
(iii) The balanced chemical reaction for the catalytic oxidation of SO₂ by air is given below:
$2 S O_{2} + O_{2} \to_{2 a t m, 450 - 500^{0} C}^{V_{2} O_{5}} 2 S O_{3}$

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