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Question
Aqueous solution of borax reacts with two mol of acids. This is because of -
Options:
A .  Formation of 2 mol of B(OH)3 only
B .  Formation of 1mol of [B(OH)4]− only
C .  Formation of 1 mol each of B(OH)3 and [B(OH)4]−
D .  Formation of 2 mol each of [B(OH)4]− and B(OH)3, of which only[B(OH)4]− reacts with acid
Answer: Option D
:
D
Na2B4O7+7H2O2B(OH)3+2Na[B(OH)4]
B(OH)3orH3BO3 is an acid and does not react with acid.
Hence Na[B(OH)4] reacts with acid.

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