Given below are descriptions of chemical tests and their observations. Perform online research to predict the elements present in the compound. Test: A small amount of the sample is mixed with cupric oxide in a test tube. The test tube is heated and the issuing gas is passed through a saturated solution of baric hydroxide.
Observation: The solution turns cloudy.
Test: A small amount of sample is added to sodium metal in a fusion tube and heated. The test tube is then plunged in to a distilled water bath. The fusion tube breaks. The content of the fusion tube is then dissolved in the distilled water, using a glass rod. The solution thus obtained is boiled and filtered. Freshly prepared solution of sodium nitroprusside is added to about 1 milliliter of the filtered solution.
Observation: The color of the solution turns violet.
Test: A compound is fused with sodium peroxide and extracted with water. This solution is heated with nitric acid and ammonium molybdate solution.
Observation: A yellow colored precipitate results.

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