Study the given flow chart carefully and answer the question.
Which group lists the items that can replace R in the flow chart?
P Q R
AIce cube Oxygen Cold Drink
BOxygen Hydrogen Water Vapour
CCoca cola Milk Vinegar
DWater Vapour Oxygen Milk
How can the answer be option B? Gases do not have definite shape or volume. Therefore P cannot be oxygen and Q cannot be Hydrogen. Pls clarify