Multiple Choice
What is the oxidation number of Mg in MgO?
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6. Chemical Quantities & Aqueous Reactions
Calculate Oxidation Numbers
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What is the oxidation state of chromium (Cr) in K2Cr2O7?
A
+2
B
+6
C
+7
D
+3
Verified step by step guidance1
Identify the overall charge of the compound K2Cr2O7, which is neutral (0).
Assign the known oxidation states: potassium (K) is always +1, and oxygen (O) is usually -2.
Set up an equation to represent the sum of oxidation states: 2(K) + 2(Cr) + 7(O) = 0, where K = +1 and O = -2.
Substitute the known values into the equation: 2(+1) + 2(x) + 7(-2) = 0, where x is the oxidation state of chromium.
Solve the equation for x to find the oxidation state of chromium in K2Cr2O7.
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