Number of correct information for the reaction

$2 S O_{2} (g) + O_{2} (g) V_{2} O_{5} 2 S O_{3} (g)$
(i) endothermic reaction
(ii) irreversible reaction
(iii) low temperature & high pressure are favorable conditions
(iv) reaction is part of the contact process

Question

Number of correct information for the reaction

$2 S O_{2} (g) + O_{2} (g) V_{2} O_{5} 2 S O_{3} (g)$

(i) endothermic reaction

(ii) irreversible reaction

(iii) low temperature & high pressure are favorable conditions

(iv) reaction is part of the contact process

TestHub · Accepted Answer

The reaction 2 S O 2 ​ ( g ) + O 2 ​ ( g ) ⇌ 2 S O 3 ​ ( g ) is exothermic and reversible, meaning statements (i) and (ii) are incorrect. According to Le Chatelier’s principle, the forward reaction is favored by low temperature (due to its exothermic nature) and high pressure (since gas moles decrease from 3 to 2), making (iii) correct. Finally, this specific oxidation is the signature step of the industrial Contact Process, so (iv) is also correct. Thus, there are 2 correct pieces of information.

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