What is the overall charge of the compound MgCr2O7?

Oxidation States and Chromium Compounds

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Chemistry
•
9th - 10th Grade
•
Hard

Amelia Wright
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9 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Positive
Variable
Neutral
Negative
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the oxidation number of magnesium in MgCr2O7?
+1
0
+3
+2
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is the oxidation number of chromium initially unknown?
It has multiple oxidation states
It is a non-metal
It is always zero
It is a noble gas
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the oxidation number of oxygen in most compounds?
+1
0
-2
-1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many chromium atoms are present in MgCr2O7?
4
1
2
3
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the oxidation number of each chromium atom in MgCr2O7?
+6
+3
+4
+5
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the total contribution of oxygen atoms to the oxidation state in MgCr2O7?
-8
-10
-12
-14
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the charge of the dichromate ion (Cr2O7)?
1+
2-
1-
2+
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What alternative method can be used to find the oxidation number of chromium?
Using the charge of the dichromate ion
Assuming chromium is a noble gas
Using the periodic table
Guessing based on color
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