A) neutral
B) acidic
C) basic
D) amphoteric
Correct Answer: C
Solution :
Its aqueous solution is alkaline due to hydrolysis. \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}+7{{H}_{2}}O\underset{strong\text{ }alkali}{\mathop{2NaOH}}\,+\underset{weak\text{ }acid}{\mathop{4{{H}_{3}}B{{O}_{3}}}}\,\]
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