Which of the following compounds are involved in the formation of sulfur trioxide?

H_{2} S_{2} O_{5}

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N a H S O_{4}

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{N a}_{2} S_{2} O_{7}

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H_{2} S_{2} O_{7}

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Solution

The correct options are
B $N a H S O_{4}$
C ${N a}_{2} S_{2} O_{7}$
Sulfur trioxide can be prepared in the laboratory by the two-stage pyrolysis of sodium bisulfate. Sodium pyrosulfate is an intermediate product:
Dehydration at $315^{0} C :$
$2 N a H S O_{4} ⟶ {N a}_{2} S_{2} O_{7} + H_{2} O$
Cracking at $460^{0} C :$
${N a}_{2} S_{2} O_{7} ⟶ {N a}_{2} S O_{4} + S O_{3}$

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