Which apparatus can be used to introduce more liquid into a reaction and also serve as a pressure valve?
A
Stopcock
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B
Pinchcock
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C
Thistle tube
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D
Flask
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E
Condenser
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Solution
The correct option is A Thistle tube Thistle tube can be used to introduce more liquid into a reaction and also serve as a pressure valve. Thistle tube is used to add small volumes of liquids to an exact position. Thistle tube can be inserted through a small hole present in some stoppers, and hence can be inserted into a container such as an Erlenmeyer flask.