A) Aq. NaOH
B) Acidic \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]
C) \[N{{a}_{2}}Cr{{O}_{4}}/{{H}_{2}}S{{O}_{4}}\]
D) \[NaN{{O}_{2}}/HCl\]
Correct Answer: A
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