Which of the following is not a redox reaction?

Question

Which of the following is not a redox reaction? (A) CaCO3 overset arrow CaO+CO2 (B) O2+2H2 overset arrow 2H2O (C) Na+H2O overset arrow NaOH+1/2H2 (D) 3H3(AsO)3 (. aq .)+BrO3 (. aq .)- overset arrow Br(. aq .)-+3H3(AsO)4 (. aq .)

Tardigrade Admin · Accepted Answer

CaCO3 overset arrow CaO+CO2 When the oxidation number of the element increases, it is oxidation and when it decreases, it is reduction. But in the above reaction, the oxidation number of Ca remains as +2 , C remains as +4 and O remains as -2 . Hence, it is not a redox reaction.

Q. Which of the following is not a redox reaction?

$C a C O_{3} \to C a O + C O_{2}$

$O_{2} + 2 H_{2} \to 2 H_{2} O$

$N a + H_{2} O \to N a O H + 1/2 H_{2}$

$3 H_{3} (A s O)_{3 (a q)} + B r O_{3 (a q)}^{-} \to B r_{(a q)}^{-} + 3 H_{3} (A s O)_{4 (a q)}$

$C a C O_{3} \to C a O + C O_{2}$
When the oxidation number of the element increases, it is oxidation and when it decreases, it is reduction.
But in the above reaction, the oxidation number of $C a$ remains as $+ 2$ , $C$ remains as $+ 4$ and $O$ remains as $- 2$ . Hence, it is not a redox reaction.

Q. Which of the following is not a redox reaction?

CaCO3​→CaO+CO2​

O2​+2H2​→2H2​O

Na+H2​O→NaOH+1/2H2​

3H3​(AsO)3(aq)​+BrO3(aq)−​→Br(aq)−​+3H3​(AsO)4(aq)​

CaCO3​→CaO+CO2​ When the oxidation number of the element increases, it is oxidation and when it decreases, it is reduction. But in the above reaction, the oxidation number of Ca remains as +2 , C remains as +4 and O remains as −2 . Hence, it is not a redox reaction.

$C a C O_{3} \to C a O + C O_{2}$

$O_{2} + 2 H_{2} \to 2 H_{2} O$

$N a + H_{2} O \to N a O H + 1/2 H_{2}$

$3 H_{3} (A s O)_{3 (a q)} + B r O_{3 (a q)}^{-} \to B r_{(a q)}^{-} + 3 H_{3} (A s O)_{4 (a q)}$