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$H_{2} {SO}_{4}$ is prepared by Decon's process.

$H_{2} {SO}_{4}$ is prepared by Contact process.

${HNO}_{2}$ is prepared by Ostwald process.

Both 2 and 3 are correct

answer is D.

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Detailed Solution

The process in which chlorine is prepared using hydrochloric acid gas with atmospheric oxygen (raw oxygen straight from photosynthesis) and cupric chloride (CuCl₂), as a catalyst is known as the Deacon process.

$4 HCl + O_{2} \to_{{CuCl}_{2}}^{400 - 450 ° C} 2 {Cl}_{2} + 2 H_{2} O$

The contact process is a popular method for manufacturing sulfuric acid on a large scale. In this process, sulfuric acid can be produced in enormous quantities. One of the most popular catalysts used in the contact process is platinum.

The Ostwald process is a popular method for manufacturing nitric acid on a large scale. Nitric acid can be produced in enormous quantities in this procedure. This is a three-stage process in which the first stage is catalytic ammonia oxidation, the second stage is nitric acid oxidation, and the third stage is the absorption of nitric acid in water.

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