下列物质在水溶液中的电离方程式错误的是                                                                           [ ]

A．CaCl₂   = Ca²⁺  +  2Cl^-          

B．NaHSO₄   = 2Na⁺  +  HSO₄^-

C．HNO₃   =  H⁺  + NO₃^-            

D．NaHCO₃  = Na+   +  HCO₃^-