Question

In the quantitative analysis of a particular crystalline phase which of the following material is used as an internal standard?

(a) β-Al2O3

(b) α-B2O5

(c) β-B2O5

(d) α-Al2O3

I had been asked this question at a job interview.

I want to ask this question from Survey of Techniques and their Applications to Solids topic in section Preparative Methods of Solid State Chemistry

Answer 1

Correct choice is (d) α-Al2O3

The best I can explain: In the quantitative analysis of a particular crystalline phase it is neccasary to add an internal standard which is a well crystallized phase such as α-Al203, to the sample in a closely controlled amount ( e.g. 10 percent by weight)