Phosphate Ion Tests Quiz

What is the empirical formula of the phosphate ion?

• PO4^3-

• CO3^2-

• SO4^2-

• NO3^-

What happens to the salt during the dry heating test?

• It swells up into a voluminous mass

• It dissolves completely

• It changes color to blue

• It emits a strong odor

Which acid is used in the test for independent radicals?

• Nitric acid

• Hydrochloric acid

• Sulfuric acid

• Acetic acid

What is formed when phosphate reacts with magnesium mixture?

• Yellow precipitate of ammonium phosphate

• White precipitate of magnesium ammonium phosphate

• Blue precipitate of copper phosphate

• Green precipitate of iron phosphate

What is the purpose of keeping the test tube undisturbed in the magnesia mixture test?

• To prevent contamination

• To ensure complete reaction

• To allow the solution to cool

• To let the precipitate settle