SATHEE: Redox Reactions And Electrochemistry Ques 356

Redox Reactions And Electrochemistry Ques 356

Question: An element A in a compound ABD has oxidation number $A^{n^{-}}$ . It is oxidised by $C r_{2} O_{7}^{2 -}$ in acid medium. In the experiment $1.68 \times 10^{- 3}$ moles of $K_{2} C r_{2} O_{7}$ was used for $3.26 \times 10^{- 3}$ moles of ABD. The new oxidation number of A after oxidation is:

Options:

A) 3

B) 3-n

C) n-3

D) +n

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Meq. of $K_{2} C r_{2} O_{7} = M e q .$ of ABD n-factor of $K_{2} C r_{2} O_{7}$ in acidic medium =6 $6 \times 1.68 \times 10^{- 3} = x \times 3.26 \times 10^{- 3}$ $x = 3$
$\Rightarrow$ New oxidation state of $A^{- n}$ will be =-n+3

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Redox Reactions And Electrochemistry Ques 356

Question: An element A in a compound ABD has oxidation number An− . It is oxidised by Cr2O72− in acid medium. In the experiment 1.68×10−3 moles of K2Cr2O7 was used for 3.26×10−3 moles of ABD. The new oxidation number of A after oxidation is:

Options:

Answer:

Solution:

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