A) \[N{{a}_{2}}S{{O}_{4}}\,\,.\,\,10\,{{H}_{2}}O\]
B) \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\,\,.\,\,5\,{{H}_{2}}O\]
C) \[CuS{{O}_{4}}\,\,.\,\,5\,{{H}_{2}}O\]
D) \[N{{a}_{2}}{{B}_{4}}{{O}_{7}}\,.\,\,10\,{{H}_{2}}O\]
Correct Answer: A
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