MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions
When Cl₂ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from (CBSE AIPMT 2012) (a)zero to +1 and zero to –5
B.zero to –1 and zero to +5✓ Correct
C.zero to –1 and zero to +3
D.zero to +1 and zero to –3
Explanation
When chlorine gas reacts with hot and concentrated NaOH solution, it disproportionate into chloride (Cl–) and chlorate 3 ClO ions 1 5 2 3 2 (ho t andconc.) 3 Cl 6NaOH 5Na Cl Na ClO 3H O → In this process, oxidation number of chlorine changes from 0 to –1 and 0 to +5