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WorksheetsOxidation - Reduction Reaction
Total questions: 12
Worksheet time: 22mins
What is the oxidation number assigned to manganese in KMnO4?
+7
+2
+4
+3
In which substance does sulfur have a negative oxidation number?
S
CaSO4
Na2S
SO2
- What is the oxidation number of chromium in K2Cr2O7
+6
+3
+5
+2
Given the electrochemical cell reaction:
Zn(s) + Ni2+ (aq) → Zn2+ (aq) + Ni(s)
Which species is the reducing agent?
Ni2+
Zn
Ni
Zn2+
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
loses electrons and is the reducing agent
gains electrons and is the reducing agent
What element is an oxidizing agent?
Na
Ca
K
a. F2
Which half-reaction correctly represents reduction?
S2– → S + 2e–
Mn7+ → Mn4+ + 3e–
Mn7+ + 3e– → Mn4+
S2– + 2e– → S
The oxidation number of Hydrogen in KH potassium hydride equals:
-2
-1
+1
+2
place in order the steps used to balance an equation by the oxidation number method .
Balance the following equations, assuming all reactions take place in an acidic solution. Show your work.
Cr2O7-2 + I- = Cr+3 + I2
Ahmed was asked to give example of an oxidation – reduction reaction. Ahmed mixed a little table salt with a solution of silver nitrate and precipitate formed. Is the example considered correct? Justify your answer?
Explain the following
Electrons do not appear in the final equation of oxidation -reduction reaction ?
