Which of the following statements are correct for SO₂ gas?

SO₂ acts as a bleaching agent under moist conditions.
${\mathrm{SO}}_2\left(\mathrm{g}\right)+2{\mathrm{H}}_2\mathrm{O}\to {\mathrm{H}}_2{\mathrm{SO}}_4+2\left[\mathrm{H}\right]$
SO₂ is oxidized to sulphuric acid and releases nascent hydrogen which bleaches the material. But this is a temporary as atmospheric oxygen reoxides the bleached matter after some time.