Oxidation-Reduction Analysis - GRE Subject Test: Chemistry
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Which molecule would be considered a Lewis acid?
Which molecule would be considered a Lewis acid?
A lewis acid is an electron pair acceptor. 
would be considered a lewis acid based on the definition. Because 
is electron-deficient based on its oxidation number, it is able to accept an electron pair.
A lewis acid is an electron pair acceptor.
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Which of the following would be considered a Lewis base?
Which of the following would be considered a Lewis base?
A lewis base is an electron pair donor. 
would be considered a lewis base based on the definition. Because 
is electron rich based on its oxidation number, it is able to donate an electron pair to an electron deficient ion.
A lewis base is an electron pair donor.
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Which of the following types of reactions best describes the following reaction:
Which of the following types of reactions best describes the following reaction:
A redox reaction is also known as an oxidation/reduction reaction. This type of reaction involves the transfer of electrons from on reactant to another. In this reaction, an electron is transferred from 
to 
forming the products 
and 
. The substance that gains an electron is referred to as being reduced. The substance that loses an electron is referred to as being oxidized.
A redox reaction is also known as an oxidation/reduction reaction. This type of reaction involves the transfer of electrons from on reactant to another. In this reaction, an electron is transferred from
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What is the oxidation state of manganese in 
?
What is the oxidation state of manganese in
In this compound oxygen has an oxidation number of 
. There are 4 oxygens, therefore the total oxidation number for the oxygens in is: 
. Potassium,
, is a group 1 metal and has an oxidation number of 
. The sum of all oxidation number in a neutral compound such as is zero. We will give the oxidation number of 
equal to 
:
Simplifying the above equation:
Rearranging to solve for 
:
In this compound oxygen has an oxidation number of
Simplifying the above equation:
Rearranging to solve for
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What is the oxidation state of manganese in 
?
What is the oxidation state of manganese in
In this compound oxygen has an oxidation number of . There are 4 oxygens, therefore the total oxidation number for the oxygens in 
is: 
. Potassium, , is a group 1 metal and has an oxidation number of . There are 3 potassium ions present in 
, therefore the total oxidation number for the potassium ions is:
.The sum of all oxidation number in a neutral compound such as 
is zero. We will give the oxidation number of equal to :
Simplifying the above equation:
Rearranging to solve for :
In this compound oxygen has an oxidation number of
Simplifying the above equation:
Rearranging to solve for
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