Identify the following : Na 2 CO 3 A B C D Also mention…

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) JEE ADVANCED Previous Year Question Subjective Type

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Identify the following :

Na 2 CO 3 A B C D

Also mention the oxidation state of S in all the compounds.

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Na 2 CO 3 + SO 2 2NaHSO 3 + CO 2

2NaHSO 3 + Na 2 CO 3 ⎯→ 2Na 2 SO 3 + H 2 O + CO 2

Na 2 SO 3 + S Na 2 S 2 O 3

2Na 2 S 2 O 3 + I 2 ⎯→ Na 2 S 4 O 6 + 2Na I

Oxidation states of S + 4 in NaHSO 3 [1 + 1 + x + 3(–2) = 0] and +4 in Na 2 SO 3 [2 + x + 3(–2) = 0] ;

+ 6 and – 2 (or an average + 2) in Na 2 S 2 O 3 and +5 and 0 (or an average + 5/2) in Na 2 S 4 O 6 .

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