某高效净水剂可由Fe(OH)SO4聚合得到。工业上可以用FeSO4、稀硫酸和亚硝酸钠为原料来制备
Fe(OH)SO4：2FeSO4+2NaNO2+H2SO4=2Fe(OH)SO4+Na2SO4+ 2NO↑，下列有关该反应的说法中错误的是 [ ]
A．Na2SO4是氧化产物
B．Fe(OH)SO4中Fe的化合价为+3
C．NaNO2是氧化剂
D．2 mol FeSO4发生反应时共有2 mol电子发生转移
答案：A
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