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Chemistry: Oxidation and Reduction
Oxidation involves:
Losing Electron; Gaining Hydrogen
Gaining Electron; Losing Hydrogen
Losing Electron; Losing Hydrogen
Gaining Electron; Gaining Hydrogen
Reduction involves:
Losing Electron; Gaining Oxygen
Losing Electron; Losing Oxygen
Gaining Electron; Gaining Oxygen
Gaining Electron; Losing Oxygen
In reaction 2Zn + O
2
→ 2ZnO, Zn is
Oxidised
Reduced
In reaction Mg + Cl
2
→ MgCl
2
, Cl
2
is
Reduced
Oxidised
In reaction Zn +H
2
O→ ZnO + H
2
, which element, if any, is oxidised?
Zinc
Hydrogen
Oxygen
In reaction NaOH + Li → LiOH + Na, Li act as:
Oxidising Agent
Reducing Agent
Another name for "oxidation-reduction" reaction is called:
Neutralisation Reaction
Chemical Reaction
Redox Reaction
Disproportionation Reaction
In reaction Cu
2
+
+ 2NO
3
-
+ 4H
+
→ Cu
2
+
+ 2NO
2
+ 2H
2
O
What is the reducing agent?
Cu
NO3-
H+
H2O
What is the oxidation number for P in PCl
5
?
+5
+3
+2
+1
Which of the following undergoes reduction?
I. 2Cl
-
→ Cl
2
II. Cl
2
→ 2Cl
-
III. Zn → Zn
2+
IV. Zn
2+
→ Zn
I and II
II and III
I and III
II and IV
Define Reducing Agent.
A species that causes others to be reduced whilst itself is oxidised.
A species that causes others to be oxidised whilst itself is also oxidised.
A species that causes others to be oxidised whilst itself is reduced.
A species that causes others to be reduced whilst itself is also reduced.
What is the oxidation number of iron(II) oxide?
+1
+2
+3
-1
CrO
4
2−
(aq)→Cr(OH)
4
−
(aq)
Chromium undergoes which of the following processes?
Oxidation
Reduction
Redox reaction
None of these above
What represents the total oxidation state for an ionic compound?
It equals the charge of the cation
It equals the charge of the anion.
It is equivalent to the magnitude of the ion with the higher charge.
It equals zero.
What is the oxidation number of chromium in CaCrO
4
?
+3
+4
+5
+6
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