AP EAMCET · Chemistry · Redox Reactions

$2 {KMnO}_{4} + 3 H_{2} {SO}_{4} + 5 H_{2} O_{2} \to K_{2} {SO}_{4} + 2 {MnSO}_{4} + 8 H_{2} O + 5 O_{2}$
Find the nonnality of $H_{2} O_{2}$ solution, if $20 mL$ of it is required to react completely with $16 mL$ of $0.02 {MKMnO}_{4}$ solution. ( Molar mass of ${KMnO}_{4} = 158 g {mol}^{- 1}$ )

A $4 \times 10^{- 2} N$
B $2 \times 10^{- 2} N$
C $6 \times 10^{- 2} N$
D $8 \times 10^{- 2} N$

Verified Solution

Answer & Solution

Correct Answer

(D) $8 \times 10^{- 2} N$

Step-by-step Solution

Detailed explanation

n.f. of H2O2=2 n.f. of KMnO4=5 Number of mequivalents of H2O 2=Number of mequivalents of KMnO4 N1V1=N2V2 N1=N2V2V1=(0.02×5)×1620=0.08 N

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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2KMnO4+3H2SO4+5H2O2→K2SO4+2MnSO4+8H2O+5O2Find the nonnality of H2O2 solution, if 20 mL of it is required to react completely with 16 mL of 0.02MKMnO4 solution. ( Molar mass of KMnO4=158 g mol-1)

Step-by-step Solution

$2 {KMnO}_{4} + 3 H_{2} {SO}_{4} + 5 H_{2} O_{2} \to K_{2} {SO}_{4} + 2 {MnSO}_{4} + 8 H_{2} O + 5 O_{2}$
Find the nonnality of $H_{2} O_{2}$ solution, if $20 mL$ of it is required to react completely with $16 mL$ of $0.02 {MKMnO}_{4}$ solution. ( Molar mass of ${KMnO}_{4} = 158 g {mol}^{- 1}$ )