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The presence of magnesium is confirmed i...

The presence of magnesium is confirmed in the qualitative analysis by:

A

titan yellow solution `+2MNaOH` solution

B

disodium hyrogen phosphate `+NH_(4)CI +NH_(3)(aq)`

C

magneson (I) reagent

D

all of the above

Text Solution

Verified by Experts

The correct Answer is:
D
(a) Titan yellow (also known as clayton yellow) is a water soluble yellow dyestuff. It is adsorbed by `Mg(OH)_(2)` producing a deep red colour or ppt.
(b) `Mg^(2+) +NH_(3) +HPO_(4)^(2-)rarr underset(("White crystalline ppt."))(Mg(NH_(4))PO_(4)darr`
(c)
`rArr` Magneson-I adsorbs on `Mg(OH)_(2)` in alkaline solution whereby a blue lake is produced.
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