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As per your syllabus, the highest oxidation state of chlorine in its compounds (e.g. HClO₄) is which?
A+3
B+7
C+1
D+5
Answer & Solution
Correct answer: B. +7
Your syllabus: highest OX = group number − 10 for groups 13–17. Cl in group 17 ⇒ +7.
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