NEET Chemistry The s-Block Elements Questions Solved


What would you observe if excess of dilute NaOH solution is added and shaken with an aqueous solution of aluminium chloride?

(a) A permanent white precipitate is formed immediately

(b) No change at first but a white precipitate is formed on standing

(c) A white precipitate is formed which later dissolves

(d) A green precipitate which turns red on standing in air

(c)

 AlCl3 + 3NaOH          Al(OH)3 + 3NaClAl(OH)3 + 3NaOH          Na3AlO3 + 3H2O                                              soluble

Difficulty Level:

  • 25%
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  • 47%
  • 6%