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Question

The gas collected in the test tube in the experiment shown below is___.


  1. carbon dioxide

  2. nitrogen

  3. combination of nitrogen and hydrogen

  4. oxygen


Solution

The correct option is D

oxygen


Oxygen. This is a classic experiment to demonstrate that oxygen is produced during photosynthesis. The hydrilla plant, being green in colour, carries out photosynthesis and oxygen is produced as a byproduct. Initially, the inverted test tube is completely filled with water, as the gas starts getting produced, one can see it bubbling in the test tube. Later, a glowing splinter test can confirm that the gas is oxygen.

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