Which of the following is not an example of redox reaction ?

C u O + H_{2} \to C u + H_{2} O

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F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}

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2 K + F_{2} \to 2 K F

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B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + 2 H C l

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Solution

The correct option is B $B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + 2 H C l$

Redox reaction involves simultaneous oxidation and reduction of reacting species. Thus change in oxidation state will decide whether a reaction is redox or not. Thus assigning the oxidation states as:

A. $+ 2 C u O +_{2} \to 0 C u +_{2} O$ : oxidation of H and reduction of Cu

B. $+ 3 F e_{2} O_{3} + 3 + 2 C O \to 2 0 F e + 3 + 4 C O_{2}$ : oxidation of C and reduction of Fe

C. $2 0 K +_{2} \to 2 + 1 K - 1 F$ : oxidation of K and reduction of F

D. $+ 2 B a C l_{2} + H_{2} S O_{4} \to + 2 B a S O_{4} + 2 H C l$ : not a redox reaction.

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Similar questions

Which of the following is not an example of redox reaction?
(a) $C u O + H_{2} \to C u + H_{2} O$
(b) $F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}$
(c) $2 K + F_{2} \to 2 K F$
(d) $B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + 2 H C l$

Justify that the following reactions are redox reactions:

(a) CuO(s) + H₂(g) → Cu(s) + H₂O(g)

(b) Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g)

(d) 2K(s) + F₂(g) → 2K+F– (s)

(e) 4 NH₃(g) + 5 O₂(g) → 4NO(g) + 6H₂O(g)

Q. The species reduce in the following reaction is :

F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}

Identify the reducing agent in the following reactions.

F e_{2} O_{3} + 3 C O \to 2 F e + 3 C O_{2}

C u O + H_{2} ⟶ H_{2} O + C u

, reaction is an example of :

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