All the following is needed for a sodium fusion test exceptA. sodium metalB. an ignition tubeC. a test tubeD. a thermometer

The sodium fusion test is a qualitative analysis technique used to detect the presence of certain elements in organic compounds. Among the given options, we can determine which item is not required for this test.

Analysis of Options:

1. A. Sodium metal - Required for the fusion process.
2. B. An ignition tube - Required to contain the reaction.
3. C. A test tube - Typically used for reactions but not specifically necessary for the sodium fusion test.
4. D. A thermometer - Useful for monitoring heat but not essential for performing the test.

Final Answer:

The item that is not needed for a sodium fusion test is C. a test tube.