The oxidation number of Cl in HClO₄, is
A - VCE - SSCE Chemistry - Question 18 - 2003 - Paper 1
Question 18
The oxidation number of Cl in HClO₄, is
A. +7
B. +5
C. +3
D. -1
Worked Solution & Example Answer:The oxidation number of Cl in HClO₄, is
A - VCE - SSCE Chemistry - Question 18 - 2003 - Paper 1
Step 1
Determine the oxidation states
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Answer
To determine the oxidation number of Chlorine (Cl) in HClO₄, we start by applying the rules of oxidation states:
The oxidation state of hydrogen (H) is +1.
The oxidation state of oxygen (O) is -2.
HClO₄ consists of one hydrogen, one chlorine, and four oxygens. Setting up the equation:
H+Cl+4O=0
Substituting the known oxidation states gives us:
+1+x+4(−2)=0
This simplifies to:
+1+x−8=0
Which results in:
x−7=0
Therefore, the oxidation state of Cl (x) is +7.
Step 2
Select the correct answer
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Answer
Based on the calculation, the oxidation number of Cl in HClO₄ is +7. Therefore, the correct answer is:
