A) \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,4{{H}_{2}}O\]
B) \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}.\,10{{H}_{2}}O\]
C) \[NaB{{O}_{2}}\]
D) \[{{H}_{2}}\]
Correct Answer: B
Solution :
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