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(B) $H_{2} + I_{2} \rightleftharpoons 2HI$ is a reversible reaction when carried out in a closed container as all reactants and products are in the ga

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$AgNO_{3} + NaCl \longrightarrow AgCl + NaNO_{3}$

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(B) $H_{2} + I_{2} \rightleftharpoons 2HI$ is a reversible reaction when carried out in a closed container as all reactants and products are in the gaseous phase.$CaCO_{3} \rightleftharpoons CaO + CO_{2}$ is a reversible reaction because the decomposition of $CaCO_{3}$ is an equilibrium process.$O_{2} + 2SO_{2} \rightleftharpoons 2SO_{3}$ is also a reversible reaction in a closed container as it involves gaseous species.$AgNO_{3} + NaCl \longrightarrow AgCl + NaNO_{3}$ is an irreversible reaction because $AgCl$ is formed as a white precipitate,which removes the product from the reaction mixture,making the backward reaction impossible.Therefore,option $B$ is correct.

Amongst the following chemical reactions,the irreversible reaction is:

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