What is structure of SO3 (in solid state) at room temperature?

 In solid phase SO₃ exist at room temperature and have two different structures i.e. alpha-SO₃ chain structure and gama- (SO₃)₃ cyclic structure (a trimer) like ice structure.

 

S-S bond is presents in? (IIT)

 (a) S₂O₄^2-  (b) S₂O₆^2-  (c) S₂O₇^2- (d) both (a) & (b) 

SOLUTION:

What is structure of SO3 (in solid state) at room temperature?

What is stucture of (H2S2O3) thiosulphuric acid?

What is stucture of (H2S2O8) Peroxydisulphuric acid or marshall's acid?