13. The standard reduction potentials for four half-cells at 298 K are given in Table 1. Table 1 Half-cell equation → H2O2 (aq) 2H2O (I) Eº/V 2H (ад) + Oz(g) + 2e' Н-О2 (аq) + 2Н (ад) + 2е —> Cl2 (g) + 2e" → MnOz (s) + 4H (ад) + 2е' +0.68 +1.77 2Cl (aq) +1.36 → Mn²* (aq) +2H2O (I) +1.22 In which of the following mixture there is NO effervescence observed? А. Н.О2 (аq) + Ch(g) B. acidified H2O2+ MnO2 (s) C. NaCl (aq) + acidified H2O2 (aq) D. NaCl (aq) + acidified MnO2 (s)

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How B shows no effervescence as O2 is produced from decomposition of h202 I suppose

13. The standard reduction potentials for four half-cells at 298 K are given in Table 1.
Table 1
Half-cell equation
H2O2 (aq)
2H2O (I)
Eº/V
2H (ад) + Оz (g) + 2e' —>
H2O2 (aq) + 2H* (aq) + 2e¯
Cl2 (g) + 2e
MnO2 (s) + 4H* (aq)+ 2e -
+0.68
+1.77
→ 2Cl (aq)
+1.36
→ Mn2+ (aq) +2H2O (I)
+1.22
In which of the following mixture there is NO effervescence observed?
A. H2O2 (aq) + Cl2 (g)
B. acidified H2O2+ MnO2 (s)
C. NaCl (aq) + acidified H2O2 (aq)
D. NaCl (aq) + acidified MnO2 (s)
Transcribed Image Text:13. The standard reduction potentials for four half-cells at 298 K are given in Table 1. Table 1 Half-cell equation H2O2 (aq) 2H2O (I) Eº/V 2H (ад) + Оz (g) + 2e' —> H2O2 (aq) + 2H* (aq) + 2e¯ Cl2 (g) + 2e MnO2 (s) + 4H* (aq)+ 2e - +0.68 +1.77 → 2Cl (aq) +1.36 → Mn2+ (aq) +2H2O (I) +1.22 In which of the following mixture there is NO effervescence observed? A. H2O2 (aq) + Cl2 (g) B. acidified H2O2+ MnO2 (s) C. NaCl (aq) + acidified H2O2 (aq) D. NaCl (aq) + acidified MnO2 (s)
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