\(\rm{HCOONa}\)加热分解时,固体失重率与温度的关系如图所示,发生的反应有:
\(\rm{2HCOONa \dfrac { \underline{\;\;\triangle \;\;}}{\;}Na_{2}C_{2}O_{4}+H_{2}↑ ①}\)
\(\rm{2HCOONa \dfrac { \underline{\;\;\triangle \;\;}}{\;}Na_{2}CO_{3}+H_{2}↑+CO↑②}\)
\(\rm{Na_{2}C_{2}O_{4} \dfrac { \underline{\;\;\triangle \;\;}}{\;}Na_{2}CO_{3}+CO↑ ③}\)
下列说法正确的是\(\rm{(}\) \(\rm{)}\)