NEET Chemistry The s-Block Elements Questions Solved


If NaOH is added to an aqueous solution of Zn2+ ions, a white precipitate appears and on adding axcess NaOH, the precepitate dissolves. In this solution zinc exists in the:

(a) cationic part

(b) anionic part

(c) both in cationic and anionic parts

(d) there is no zinc left in the solution

(b) 

Zn2+ + 2NaOH          2Na+ + Zn(OH)2Zn(OH)2 + 2NaOH         Na2ZnO2 + 2H2OThus, Na2ZnO2 forms 2 Na+ and ZnO22-ions.

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