ChemistryInorganic: D and F Block Elements

Addition of NaOH on Zn2+ ion gives a white ppt. which on addition of…

Addition of NaOH on Zn²⁺ ion gives a white ppt. which on addition of excess of NaOH which dissolves. In this solution Zn exists in which of the following form?

Answer & explanation

Correct answer: option 3

$Z n_{2} + + 2 O H -^{\to} Z n (O H)_{2}$ (white ppt.).
In excess of NaOH, it dissolves and form complex.
$Z n (O H)_{2} + 2 O H -^{\to} Z n (O H)_{4 2 -}$
In this complex, oxidation state of Zn is +2.