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Types of Redox Reactions

Which of the ...

Question

Which of the following represent redox reactions?

{C r}_{2} O_{7}^{2 -} + 2 ⊖ O H ⟶ 2 C r O_{4}^{2 -} + H_{2} O

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S O_{3}^{2 -} + H_{2} O + I_{2} ⟶ S O_{4}^{2 -} + 2 I^{⊖} + 2 H^{\oplus}

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C a {(O H)}_{2} + {C l}_{2} ⟶ C a {(O C l)}_{2} + C a {C l}_{2}

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P {C l}_{5} ⟶ P {C l}_{3} + {C l}_{2}

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Solution

The correct options are
B $S O_{3}^{2 -} + H_{2} O + I_{2} ⟶ S O_{4}^{2 -} + 2 I^{⊖} + 2 H^{\oplus}$
C $C a {(O H)}_{2} + {C l}_{2} ⟶ C a {(O C l)}_{2} + C a {C l}_{2}$
D $P {C l}_{5} ⟶ P {C l}_{3} + {C l}_{2}$
${C r}_{2} O_{7}^{2 -} + 2 ⊖ O H ⟶ 2 C r O_{4}^{2 -} + H_{2} O$
+6 +6
$S O_{3}^{2 -} + H_{2} O + I_{2} ⟶ S O_{4}^{2 -} + 2 I^{⊖} + 2 H^{\oplus}$
+4 0 +6 -1
$C a {(O H)}_{2} + {C l}_{2} ⟶ C a {(O C l)}_{2} + C a {C l}_{2}$
0 +1 -1
$P {C l}_{5} ⟶ P {C l}_{3} + {C l}_{2}$
+5 +3
In (A), there in no change in the oxidation state (+6) of Cr.
Therefore, it is not a redox reaction.

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