Which of the following is the structure of the tetrathionate ion?

Which among the following is $NOT$ the use of $SO_2$ gas?

Which form of sulphur shows paramagnetic behaviour?

In the case of hydrides of the oxygen family,which of the following physical properties changes regularly on moving down the group?

The bleaching action of $SO_2$ is due to its:

Among the following allotropic forms of sulphur,the number of allotropic forms,which will show paramagnetism is ..... .
$(A)$ $\alpha$-sulphur
$(B)$ $\beta$-sulphur
$(C)$ $S_2$-form