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(C) The decomposition of $H_{2}O_{2}$ is: $2H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$. This is correct.$(b)$ Thermal decomposition of these salts also y

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$(a)$,$(b)$,$(c)$ and $(d)$

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(C) The decomposition of $H_{2}O_{2}$ is: $2H_{2}O_{2} \rightarrow 2H_{2}O + O_{2}$. This is correct.$(b)$ Thermal decomposition of these salts also yields dioxygen:$2KClO_{3} \xrightarrow{\Delta} 2KCl + 3O_{2}$$2Pb(NO_{3})_{2} \xrightarrow{\Delta} 2PbO + 4NO_{2} + O_{2}$$2NaNO_{3} \xrightarrow{\Delta} 2NaNO_{2} + O_{2}$. This is correct.$(c)$ In the industrial process,$2$-ethylanthraquinol is oxidized by air to produce $H_{2}O_{2}$ and $2$-ethylanthraquinone,which is then recycled. This is correct.$(d)$ $H_{2}O_{2}$ is used in the synthesis of sodium perborate from borax and sodium hydroxide. This is correct.Therefore,all statements $(a)$,$(b)$,$(c)$,and $(d)$ are correct.

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