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

carbon dioxide

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nitrogen

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oxygen

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Solution

The correct option is C 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 will be completely filled with water. Later, gas produced can be seen as bubbles in the test tube. A glowing splinter test can confirm that the gas produced is oxygen.

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