$\mathrm{SO_3}$ is first absorbed in concentrated $\mathrm{H_2SO_4}$ to form—

Question

Accepted Answer

oleum ($\mathrm{H_2S_2O_7}$)

Answer

$\mathrm{H_2SO_3}$

Answer

$\mathrm{H_2S}$

Answer

$\mathrm{Na_2SO_4}$

SO3\mathrm{SO_3}SO3​ is first absorbed in concentrated H2SO4\mathrm{H_2SO_4}H2​SO4​ to form—