SELECT * FROM question_mgmt as q WHERE id=3172 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=52 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 11th chemistry The p Block Elements what happens when a borax is heated strongly

Question:

What happens when

(a) Borax is heated strongly,

(b) Boric acid is added to water,

(c) Aluminium is treated with dilute NaOH,

(d) BF3 is reacted with ammonia?

Answer:

(a) When heated, borax undergoes various transitions. It first loses water molecules and swells. Then, it turns into a transparent liquid, solidifying to form a glass-like material called borax bead.

Na2B4O7.10H2O   →   Na2B4O7   →   2NaBO2  +  B2O3

   Borax                      Sodium Metaborate     Boric anhydride

 

(b) When boric acid is added to water, it accepts electrons from -OH ion.

B(OH)3 + 2HOH   →   [B(OH)4]-   +   H3O+

 

(c) Al reacts with dilute NaOH to form sodium tetrahydroxoaluminate(III). Hydrogen gas is liberated in the process.

2AI(s) + 2NaOH(aq) + 6H2O(l)   →  2Na+[Al(OH)4]-(aq)  + 3H2(g)

 

(d) BF3 (a Lewis acid) reacts with NH3 (a Lewis base) to form an adduct. This results in a complete octet around B in BF3.

F3B   +  :NH3   →   F3B   ←:NH3

 


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