SATHEE: Redox Reactions And Electrochemistry Ques 670

Redox Reactions And Electrochemistry Ques 670

Question: How many electrons are involved in the following redox reaction-

$C r_{2} O_{7}^{2 -} + F e^{2 +} + C_{2} O_{4}^{2 -} \to C r^{3 +} + F e^{3 +} + C O_{2}$ (Unbalanced)

Options:

A) 3

B) 4

C) 6

D) 5

Show Answer

Answer:

Correct Answer: A

Solution:

[a] The reaction given is $C r_{2} O_{7}^{2 -} + F e^{2 +} + C_{2} O_{2}^{2 -} \overset{}{\to} C r^{3 +} + F e^{3 +} + C O_{2}$ $C r_{2} O_{7}^{2 -} \overset{}{\to} 2 C r^{3 +}$ On balancing $14 H^{+} + C r_{2} O_{7}^{2 -} \overset{}{\to} 2 C r^{3 +} + 7 H_{2} O$ …..(i) $F e^{2 -} \overset{}{\to} F e^{3 +} + e^{-}$ ….(ii) $C_{2} O_{4}^{2 -} \overset{}{\to} 2 C O_{2} + 2 e^{-}$ …(iii) On adding all the three equations. $C r_{2} O_{7}^{2 -} + F e^{2 +} + C_{2} O_{4}^{2 -} + 14 H^{+} + 3 e^{-}$ $\overset{}{\to} 2 C r^{3 +} + F e^{3 +} + 2 C O_{2} + 7 H_{2} O$ Hence the total no. of electrons involved in the reaction = 3

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Redox Reactions And Electrochemistry Ques 670

Question: How many electrons are involved in the following redox reaction-

Options:

Answer:

Solution:

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