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

The answer is D. a thermometer.

The sodium fusion test, also known as the Lassaigne's test, is used to detect the presence of certain elements like nitrogen, sulphur, and halogens in an organic compound. The materials needed for this test are:

A. Sodium metal: This is used to break down the organic compound and convert the elements into their ionic forms.

B. An ignition tube: This is where the sodium metal and the organic compound are heated together.

C. A test tube: The fused mass obtained from the ignition tube is transferred into a test tube for further testing.

D. A thermometer: This is not needed for a sodium fusion test. The test is qualitative, not quantitative, so there's no need to measure temperature.