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As, Q is wearing orange coloured dress, there are two students who got the ranks between the ranks of the students wearing orange and white colored dress.
From (iii), we have the following two possibilities:

From (i) and (iv), one of Q,U and T is wearing orange colored dress.
→ One of P and S is wearing blue colored dress.
From (i) and above results, S can’t wear blue colored dress.
→ P is wearing blue colored dress.
From (v), none of Q, T and U is wearing white colored dress.
→ S is wearing white colored dress.
→ Q, U, T are wearing red, green and orange colored dress in any order.
From (i), (v) and above results, T must be wearing orange colored dress.
From (ii) as U is not wearing green colored dress, U must be wearing red colored dress.
→ Q is wearing green colored dress.