Which of the following is a redox reaction?(i | vedclass

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(D) The correct answer is $(iv)$.$A$ redox reaction is one in which oxidation and reduction occur simultaneously.$(i) \, CdCl_2 + 2 KOH \longrightarro

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$(iv)$

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(D) The correct answer is $(iv)$.$A$ redox reaction is one in which oxidation and reduction occur simultaneously.$(i) \, CdCl_2 + 2 KOH \longrightarrow Cd(OH)_2 + 2 KCl$: This is a double displacement reaction where no change in oxidation state occurs.$(ii) \, BaCl_2 + K_2SO_4 \longrightarrow BaSO_4 + 2 KCl$: This is also a double displacement reaction.$(iii) \, CaCO_3 \longrightarrow CaO + CO_2$: This is a thermal decomposition reaction.$(iv) \, 2 Ca + O_2 \longrightarrow 2 CaO$: Here,the oxidation state of $Ca$ increases from $0$ to $+2$ (oxidation) and the oxidation state of $O$ decreases from $0$ to $-2$ (reduction). Since both processes occur simultaneously,it is a redox reaction.

Which of the following is a redox reaction?
$(i) \, CdCl_2 + 2 KOH \longrightarrow Cd(OH)_2 + 2 KCl$
$(ii) \, BaCl_2 + K_2SO_4 \longrightarrow BaSO_4 + 2 KCl$
$(iii) \, CaCO_3 \longrightarrow CaO + CO_2$
$(iv) \, 2 Ca + O_2 \longrightarrow 2 CaO$

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Which of the following is a redox reaction?$(i) \, CdCl_2 + 2 KOH \longrightarrow Cd(OH)_2 + 2 KCl$$(ii) \, BaCl_2 + K_2SO_4 \longrightarrow BaSO_4 + 2 KCl$$(iii) \, CaCO_3 \longrightarrow CaO + CO_2$$(iv) \, 2 Ca + O_2 \longrightarrow 2 CaO$