Question

The presence of magnesium is confirmed in the qualitative analysis by:
A. titan yellow solution +`2M NaOH` solution
B. disodium hydrogen phosphate +`NH_(4)Cl+NH_(3) (aq)`
C. magneson `(l)` reagant
D. All of these

Answer 1

Correct Answer - D
(A)titan yellow is absorbed by magnesium hydroxide producing a deep-red colour or precipitate.
(B)`Mg^(2+) +NH_(3) +HPO_(4)^(2-) to Mg(NH_(4))PO_(4)darr` (white)
( C)Blue lake is formed by the adsorption of reagent on `Mg(OH)_(2)`.