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Worksheets1.1 Oxidation & Reduction (B)
Total questions: 15
Worksheet time: 8mins
Reduction is the ___________ of electrons.
loss
gain
transfer
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What is the oxidation number of iodine in KIO3?
5
1
0
-1
Determine the oxidation number of chromium in CrO42-.
5
6
4
2
Which statement is true:
Mg → Mg2+ + 2e–
Mg gains 2 electrons
Mg2+ loses 2 electron
Mg loses 1 electron
Mg loses 2 electrons
A decrease in oxidation number.
Oxidation
combination
reduction
Substance that oxidizes another substance by accepting its electrons.
oxidising agent
reducing agent
combustion
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
Cu --> Cu+2
Cu + 2 e- --> Cu+2
Cu - 2e- --> Cu+2
Cu --> Cu+2 + 2 e-
In a redox reaction, the species reduced
gains electrons and is the oxidizing agent
loses electrons and is the oxidizing agent
gains electrons and is the reducing agen
loses electrons and is the reducing agent
Substance that oxidizes another substance by accepting its electrons.
oxidation number
reducing agent
oxidizing agent
What is the oxidation number assigned to manganese in KMnO4?
7
5
4
0
In which substance does sulfur have a negative oxidation number?
Na2S
SO2
S
The oxidation number of Hydrogen in KH potassium hydride equals:
-1
+1
0
2
What is the oxidation number of chlorine in ClO3- ?
5
1
0
2
What is the colour change of acidified KMnO4 solution when it is used as an oxidising agent?
from colourless to brown
from purple to colourless
from brown to colourless
from colourless to purple
An aqueous solution of potassium iodide turns from colourless to brown. What happens to the iodide ions?
Iodide ions are oxidised due to gain of electrons.
Iodide ions are oxidised due to loss of electrons.
Iodide ions are reduced due to loss of electrons.
Iodide ions are reduced due to gain of electrons.
