Choose or find odd word - Green , Violet , Red , Yellow

B. VIOLET

Choose or find odd number - 2 , 16 , 56 , 128

C. 56

Choose or find odd letter group - CROWD , FLUSH , JUDGE , SCANT

C. JUDGE

Choose or find odd word - Lake , Sea , River , Pool , Pond

C. RIVER

Choose or find odd word - Radium , Thorium , Sodium , Polonium , Uranium

C. SODIUM