反应MgCl<sub>2</sub>(s)=Mg(s)+Cl<sub>2</sub>(g),Δ<sub>r</sub>H<sup>Θ</sup><sub>m</sub>>0,标准状态下,此反应:()
A、高温自发
B、低温自发
C、任何温度均自发
D、任何温度均不可能自发
A、高温自发
B、低温自发
C、任何温度均自发
D、任何温度均不可能自发
A、2NO<sub>2sub>⇆N<sub>2sub>O<sub>4sub>(正反应为放热反应) B、C(s)+CO<sub>2sub>⇆2CO(正反应为吸热反应) C、N<sub>2sub>+3H<sub>2sub>⇆2NH<sub>3sub>(正反应为放热反应) D、H<sub>2sub>S⇆H<sub>2sub>+S(s)(正反应为吸热反应)
A、FeCl<sub>3sub> B、FeCl<sub>2sub> C、ZnCl<sub>2sub> D、MgCl<sub>2sub>
A、NaCI B、MgCl<sub>2sub> C、CaCl<sub>2sub> D、H<sub>2sub>S
A、NH<sub>3sub>·H<sub>2sub>O B、MgCl<sub>2sub> C、HAc D、H<sub>2sub>O
A、CH<sub>4sub>+2S<sub>2sub>→CS<sub>2sub>+H<sub>2sub>S B、CH<sub>4sub>+2S<sub>2sub>→CS<sub>2sub>+2H<sub>2sub>S C、CH<sub>4sub>+S<sub>2sub>→CS<sub>2sub>+2H<sub>2sub> D、CH<sub>4sub>+3S<sub>2sub>→CS<sub>2sub>+4H<sub>2sub>S
A、Na<sub>2sub>SO<sub>4sub>, NaHCO<sub>3sub> B、Na<sub>2sub>SO<sub>4sub>, MgCl<sub>2sub> C、MgCl<sub>2sub>, CaCl<sub>2sub> D、NaHCO<sub>3sub>, CaCl<sub>2sub>
A、Ag<sub>2sub>O(s) = 2Ag(s) + 1/2O<sub>2sub>(g) B、N<sub>2sub>O<sub>4sub>(g) = 2NO<sub>2sub>(g) C、Fe<sub>2sub>O<sub>3sub>(s) +3/2C(s) = 2Fe(s) +1/2CO<sub>2sub>(g) D、6C(s) + 6H<sub>2sub>O(g) = C<sub>6sub>H<sub>12sub>O<sub>6sub>(s)
A、CO<sub>2sub>+H<sub>2sub>S→CS<sub>2sub>+2H<sub>2sub>O B、CO<sub>2sub>+2S→CS<sub>2sub>+O<sub>2sub> C、CO<sub>2sub>+2H<sub>2sub>S→CS<sub>2sub>+H<sub>2sub>O D、CO<sub>2sub>+2H<sub>2sub>S→CS<sub>2sub>+2H<sub>2sub>O
A、CS<sub>2sub>+H<sub>2sub>O→COS+H<sub>2sub>S B、CS<sub>2sub>+2H<sub>2sub>O→CO<sub>2sub>+2H<sub>2sub>S C、CS<sub>2sub>+H<sub>2sub>O→CO+H<sub>2sub>S D、2CS<sub>2sub>+H<sub>2sub>O→2COS+<sub>2sub>
A、CaCO<sub>3sub>(s)=CaO(s)+CO<sub>2sub>(g) B、N<sub>2sub>O<sub>4sub>(g)=2NO<sub>2sub>(g) C、2ZnS(s)+3O<sub>2sub>(g)=2ZnO(s)+2SO<sub>2sub>(g) D、CO(g)+H<sub>2sub>O(g)=CO<sub>2sub>(g)+H<sub>2sub>(g)