Chemistry - Salt Analysis Question with Solution | TestHub
From the aqueous solution of 'A' on sequential tests of group analysis for cations, reddish brown ppt is observed with group-III reagent :
Find the oxidation state of metal present in salt "A"
Options:
Answer:
Solution:
The group-III reagent for cation analysis typically involves NH₄Cl and NH₄OH. A reddish-brown precipitate (ppt) is characteristic of Fe³⁺ ions, which form Fe(OH)₃. Therefore, the metal in salt "A" is likely iron in the +3 oxidation state.
However, the question asks for the oxidation state of "metal present in salt 'A'", not specifically the cation that precipitates. If "A" is a complex salt or contains other metals, the oxidation state of the *specific* metal forming the reddish-brown ppt is +3, but the overall oxidation state of *all* metals in "A" cannot be confirmed without more information. Therefore, it cannot be predicted in a confirmed manner.
Final Answer is D.