【单选题】
将<img class="kfformula" src="20200623/1592893099409428.png" data-latex="{Fe(OH)}_{2}" width="101" height="24"/>露置在空气中加热灼烧所得的产物为()。
①
<img class="kfformula" src="20200623/1592893099585801.png" data-latex="{Fe}_{2}{O}_{3}" width="81" height="32"/>
②
<img class="kfformula" src="20200623/1592893099561989.png" data-latex="F{e}_{2}{O}_{3}" width="88" height="36"/>
④
<img class="kfformula" src="20200623/1592893099960836.png" data-latex="{Fe(OH)}_{3}" width="96" height="32"/>
【单选题】
下列离子方程式改写成化学方程式正确的是( )。
①
<img class="kfformula" src="20200708/1594171736105845.png" data-latex="{CO}_{2}+{2OH}^{-}==={C{O}_{3}}^{2-}+{H}_{2}O\, \, \, C{O}_{2}+{Ca(OH)}_{2}===CaC{O}_{3}\downarrow +{H}_{2}O" width="523" height="37"/>
②
<img class="kfformula" src="20200708/1594171736247917.png" data-latex="Fe+{Cu}^{2+}==={Fe}^{2+}+Cu\, \, \, Fe+{Cu(OH)}_{2}==={Fe(OH)}_{2}+Cu" width="483" height="37"/>
③
<img class="kfformula" src="20200708/1594170869750528.png" data-latex="{Ag}^{+}+{Cl}^{-}==={AgCl\downarrow \, \, \, AgNO}_{3}+HCl==={AgCl\downarrow +HNO}_{3}" width="463" height="37"/>
④
<img class="kfformula" src="20200708/1594170869665944.png" data-latex="{Mg}^{2+}+{2OH}^{\_ }===Mg{(OH)}_{2}\downarrow \, \, \, {MgSO}_{4}+{Ba(OH)}_{2}==={Mg(OH)}_{2}\downarrow +{BaSO}_{4}\downarrow " width="561" height="37"/>