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(C) In the given reactions,we analyze the products formed:$(A)$ $PbO_2 + H_2O_2 \longrightarrow PbO + H_2O + O_2$ (Oxygen gas is formed).$(B)$ $2KMnO_

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$PbS + 4H_2O_2 \longrightarrow PbSO_4 + 4H_2O$

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(C) In the given reactions,we analyze the products formed:$(A)$ $PbO_2 + H_2O_2 \longrightarrow PbO + H_2O + O_2$ (Oxygen gas is formed).$(B)$ $2KMnO_4 + 3H_2SO_4 + 5H_2O_2 \longrightarrow K_2SO_4 + 2MnSO_4 + 8H_2O + 5O_2$ (Oxygen gas is formed).$(C)$ $PbS + 4H_2O_2 \longrightarrow PbSO_4 + 4H_2O$ (Lead sulphate is a solid,and water is a liquid; no gas is formed).$(D)$ $Cl_2 + H_2O_2 \longrightarrow 2HCl + O_2$ (Oxygen gas is formed).Therefore,the reaction in option $C$ does not produce a gaseous product.

Which one of the following reactions does not form a gaseous product?

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