AIPMT PRELIMS2012Chemistry-Redox Reactions
AIPMT PRELIMS 2012 Chemistry Oxidation States MCQ Question
Type: MCQ-conceptual-Medium-Class 11
When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
A
Zero to +1 and zero to –3
B
Zero to +1 and zero to –5
C
Zero to –1 and zero to +5
D
Zero –1 and zero to + 3
Correct Answer
Option C
Detailed Explanation
In the reaction Cl₂ + NaOH (hot conc.) → NaCl + NaClO₃, chlorine is reduced to NaCl (oxidation stat) and oxidized to NaClO₃ (oxidation state +5).
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