In analysis of third contains of mixture analysis, solid `NH_(4)Cl` is added prior to `NH_(4)OH` for the following

Options

A. Availability of `Cl^(-)` ions
B. Availabity of `NH_(4)^(+)` ions
C. Completed dissociation of `NH_(4)OH`
D. Controlled dissociated of `NH_(4)OH`

Answer

D

Explanation

`NH_(4)Cl` ionize to give common ion `NH_(4)^(+)` which decreases the ionization of `NH_(4)OH` giving low `[OH^(-)]`.
Hence III group cations precipitated as hydroxides.