Which of the two flask a or b is a control experiment to prove that oxygen is used up in respiration
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"A"is a control experiment to prove that oxygen is used up in respiration
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"A" is a control in two flasks because when a burning piece of paper is placed in flask "A" it will immediately be put off but when it is place in flask "B" it will remain burning for a short period of time this states that flask "A"does not support combustion and hence it will put off the burning paper because of which it will be a control.
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