• question_answer Colour of iodine solution is disappeared by shaking it with aqueous solution of [CPMT 1979, 81; MP PET/PMT 1988; MP PMT 1986; RPMT 1997, 2002] A) ${{H}_{2}}S{{O}_{4}}$ B) $N{{a}_{2}}S$ C) $N{{a}_{2}}{{S}_{2}}{{O}_{3}}$ D) $N{{a}_{2}}S{{O}_{4}}$

Correct Answer: C

Solution :

$2N{{a}_{2}}{{S}_{2}}{{O}_{3}}+{{I}_{2}}\,\to \,2NaI+N{{a}_{2}}{{S}_{4}}{{O}_{6}}$

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