The reaction that does not proceed in forward direction is :

B e F_{2} + H g I_{2} ⟶ B e I_{2} + H g F_{2}

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L i I + C s F \to L i F + C s I

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C u I_{2} + 2 C u F ⟶ C u F_{2} + 2 C u I

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C a S + H_{2} O ⟶ C a O + H_{2} S

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Solution

The correct option is B $C a S + H_{2} O ⟶ C a O + H_{2} S$
The reaction that does not proceed in forward direction is (D) $C a S + H_{2} O ⟶ C a O + H_{2} S$
In the above reaction, the products are $C a O$ (a basis oxide) and $H_{2} S$ (an acid).
An acid reacts with a base to form salt and water. Hence, the above reaction will proceed in the reverse direction.
It will not proceed in the forward direction.

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