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In a lab work, a teacher has given zinc ...

In a lab work, a teacher has given zinc salt solution for systematic analysis to two students studetn I added `NH_4Cl` followed by `NH_4OH` and student II added `NH_4OH` followed by `NH_4Cl` for the analyse of group III cations.
Predict the observation of each student. Give reasons for difference in observation in any.

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