3. Four samples of milk were treated as show below in diagrams 1, 2, 3 and 4. 5.
3.
Four samples of milk were treated as show below in diagrams 1, 2, 3 and 4. 5. 3 Left open 1 Sealed without boiling 2 Boiled, then left open without Boiled, then sealed boiling In which flask will the milk take longest to turn sour?