NEET Chemistry The s-Block Elements Questions Solved


Excess of dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

(a) A light blue precipitate is first formed which finally dissolves to give a deep blue solution

(b) A white precipitate appears which dissolves to give a colourless solution.

(c) A white precipitation is formed which does not dissolve 

(d) No change takes place and the solution remains clear

(b) ZnSO4 + 2NaOH         Zn(OH)2 + Na2SO4                                              ppt.

Zn(OH)2 + 2NaOH         Na2ZnO2 + 2H2O                                               soluble

Difficulty Level:

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