OXIDATION NUMBER
Quiz
•
Chemistry
•
11th - 12th Grade
•
Practice Problem
•
Hard
Helen Jayanthi
Used 23+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Free elements are assigned an oxidation number of 0.
Which one of the following statements is incorrect?
The oxidation number of sodium (Na) in the metal sodium is 0.
Ions cannot have an oxidation number of 0.
The oxidation number of calcium in the calcium ion (Ca2+) is 0.
The oxidation number of hydrogen in the hydrogen molecule (H2) is 0.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the oxidation number of chlorine in KClO3?
-1
+5
+3
+1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The alkaline earth metals (Be, Mg, Ca, Sr, Ba, and Ra) are always assigned an oxidation state of +2.
What is the oxidation number of sulfur in magnesium sulfide (MgS)?
-1
-2
+1
+2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the oxidation numbers of copper on the left and right hand sides of the following equation?
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
+1 and +2
0 and +2
-1 and -2
0 and -2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Oxygen in a compound has an oxidation number of -2. One of the exceptions to this rule is when oxygen
is bonded to hydrogen in water.
is bonded to chlorine.
is bonded to a metal forming a metallic oxide.
is bonded to the more electronegative fluorine.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When mercuric oxide is heated it breaks down to mercury and oxygen as follows:
HgO → Hg + O2
What is the oxidation number of mercury in mercuric oxide?
+1
+2
-1
-2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are the oxidation numbers of the elements in sulfuric acid, H2SO4?
H = +2, S = +6, O = -8
H = +2, S = +1, O = +4
H = +1, S = +4, O = -2
H = +1, S = +6, O = -2
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