Why does the procedure call for a sample containing no more than 60 mg of Mg²⁺?

Why is the solution acidified with HCl before adding the precipitant?

Why is the acid–base indicator methyl red added to the solution?

Explain why forming Mg(PO₃)₂ instead of Mg₂P₂O₇ increases the precipitate’s mass.

What additional steps, beyond those discussed in questions 2 and 3, help improve the precipitate’s purity?

Why is the precipitate rinsed with a solution of 5% v/v NH₃?

Which of the following is not a type of Spectroscopy?
a) Gamma ray
b) X ray
c) Nuclear magnetic resonance
d) Sound

Teaching is defined as
An informative process
An informal process
An initiative process
An interactive process

Basic teaching model was developed by
Robert Glaser
Robert Gagne
E. Thorndike
B.F. Skinner

The number of components in the basic teaching model is
Three
Four
Five
Six

The ‘3M’ concept in instructional procedures refers to
Methods, Message and Materials
Methods, Materials and Media
Methods, Media and Message
Methods, Materials and Marking