Which of the following compounds gives chlorine dioxide when it reacts with SO2 in the presence of acid?
A
Sodium chloride
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B
Sodium chlorate
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C
Sodium perchlorate
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D
Sodium chlorite
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Solution
The correct option is C Sodium chlorate Commerciallychlorine dioxide is prepared by passing SO2 gas into mixture of sodium chlorate and H2SO4 having NaCl in traces. 2NaClO3sodiumchlorate+SO2+H2SO4Trace−−−→NaCl2ClO2Chlorinedioxide+2NaHSO4