Which substance is oxidized in the chemical reaction NiO2 + Cd + 2H2O --> Ni(OH)
ID: 785003 • Letter: W
Question
Which substance is oxidized in the chemical reaction NiO2 + Cd + 2H2O --> Ni(OH)2 + Cd(OH)2?
Cd
Cd(OH)2
NiO2
Ni(OH)2
H2O
Which of the following reactions is NOT a redox reaction?
HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l)
Fe(s) + 2 HCl(aq) --> FeCl2(aq) + H2(g)
2 C(s) + O2(g) --> 2 CO(g)
2 H2O(l) --> 2 H2(g) + O2(g)
2 Na(s) + Br2(g) --> 2 NaBr(aq
Which substance is oxidized in the chemical reaction NiO2 + Cd + 2H2O rightarrow Ni(OH)2 + Cd(OH)2? Which of the following reactions is NOT a redox reaction?Explanation / Answer
In the first part of this question, the substance being oxidized in the given reaction is Cd, since its oxidation number on the left side is zero due to it being a pure element, and its oxidation number on the right is 2+ (since the two hyroxides are -2 and all compounds have to be neutral).
In the second part of this question, HCl + NAOH --> NaCl + H20 is NOT a redox reaction since none of the elements in this reaction change their oxidation numbers.
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