Chemical Spot Tests & Staining Methods

What is the chemical name of AlO(OH)?

• hydroxide oxido aluminum

• aluminum hydroxide

• aluminum oxyhydroxide

Which rock/mineral does NOT contain calcium?

• gypsum

• bauxite

• apatite

What color is produced in spot test analysis of chromium?

• White

• Purple/pink

• Blue

Which elements may be present in the same solution?

• Co and Fe

• Cr and Fe

• Cu and Fe

Which element has 390 ppm abundance in the Earth's crust?

• Barium

• Gold

• Cobalt

In the test for presence of Mn, sodium bismuthate is added to the sample solution in ____.

• powder form

• 20% solution

• both

The most common form of phosphate rock is ____.

• brucite

• apatite

• none of the above

Formation of brown and blue colors indicates presence of ____.

• copper

• iron

• iron and copper

The test applicable for sample containing high value of molybdenum uses _____.

• nitric acid

• hydrochloric acid

• sulfuric acid

Carbonate minerals are present in which type of rocks?

• sedimentary rocks

• igneous rocks

• metamorphic rocks

• all of the above