【单选题】
在25℃时,某稀溶液中由水电离产生的c(<img class="kfformula" src="20200629/1593409863586578.png" data-latex="{H}^{+}" width="55" height="33"/>)为<img class="kfformula" src="20200629/1593409863637708.png" data-latex="{10}^{-13}" width="55" height="30"/>mol/L,下列有关溶液的叙述,正确的是()。
【单选题】
<img class="kfformula" src="20200629/1593439636655909.png" data-latex="{SO}_{2}" width="49" height="35"/>、<img class="kfformula" src="20200629/1593439636994562.png" data-latex="{NO}_{2}" width="43" height="32"/>是大气污染的主要污染物,下列污染现象主要与<img class="kfformula" src="20200629/1593439636757302.png" data-latex="{SO}_{2}" width="48" height="30"/>有关的是()。
【单选题】
下列溶液中的<img class="kfformula" src="20200706/1594021125433964.png" data-latex="c({C1}^{-})" width="56" height="30"/>与50mL 1mol/L氯化钠溶液中<img class="kfformula" src="20200706/1594021125862918.png" data-latex="c({C1}^{-})" width="66" height="31"/>相等的是( )。
②
75mL 2mol/L <img class="kfformula" src="20200707/1594088288421797.png" data-latex="{CaCl}_{2}" width="66" height="30"/>溶液
④
75mL 1mol/L<img class="kfformula" src="20200707/1594088288381919.png" data-latex="{FeCl}_{2}" width="62" height="30"/> 溶液
【单选题】
除去<img class="kfformula" src="20200629/1593439477401116.png" data-latex="{CO}_{2}" width="47" height="31"/>中混有的少量<img class="kfformula" src="20200629/1593439477395990.png" data-latex="{SO}_{2}" width="52" height="33"/>气体,可选用试剂( )。
③
饱和<img class="kfformula" src="20200629/1593439477463503.png" data-latex="NaH{CO}_{3}" width="84" height="35"/>溶液
【单选题】
欲使0.1mol/L的<img class="kfformula" src="20200629/1593414655316335.png" data-latex="NaH{CO}_{3}" width="77" height="33"/>溶液中c(<img class="kfformula" src="20200629/1593414655655850.png" data-latex="{H}^{+}" width="39" height="28"/>)、c(<img class="kfformula" src="20200707/1594094658266332.png" data-latex="{{CO}_{3}}^{2-}" width="77" height="37"/>)、c(<img class="kfformula" src="20200706/1594030018177834.png" data-latex="{HC{O}_{3}}^{-}" width="80" height="36"/>)都减小,其方法是()。
【单选题】
在313K时,水的Kw=<img class="kfformula" src="20200629/1593411014820108.png" data-latex="{3.8\times 10}^{14}" width="80" height="30"/>,若在313K时,c(<img class="kfformula" src="20200629/1593411014176240.png" data-latex="{H}^{+}" width="53" height="27"/>)=1.0×<img class="kfformula" src="20200629/1593411014850827.png" data-latex="{10}^{-7}" width="50" height="34"/>mol/L的溶液()。
【单选题】
下列物质属于电解质的是( )。①NaOH ②<img class="kfformula" src="20200706/1594029469538290.png" data-latex="{BaSO}_{4}" width="73" height="38"/> ③Cu ④蔗糖 ⑤<img class="kfformula" src="20200706/1594029469775716.png" data-latex="{CO}_{2}" width="55" height="34"/>
【单选题】
判断反应<img class="kfformula" src="20200706/1594024312213717.png" data-latex="{2FeCl}_{2}" width="57" height="31"/>+<img class="kfformula" src="20200706/1594024312918638.png" data-latex="{Cl}_{2}" width="50" height="36"/>==<img class="kfformula" src="20200706/1594024312394991.png" data-latex="{2FeCl}_{3}" width="80" height="33"/>的反应类型( )。
【单选题】
已知<img class="kfformula" src="20190809/1565317530438878.png" data-latex="a,b,c"/>是公比为2的等比数列,则<img class="kfformula" src="20190809/1565317530533557.png" data-latex="\frac {{b}^{2}} {ac}" width="74" height="64"/>等于( )
①
<img class="kfformula" src="20190809/1565317530127108.png" data-latex="\frac {1} {2}"/>
②
<img class="kfformula" src="20190809/1565317530414229.png" data-latex="1"/>
③
<img class="kfformula" src="20190809/1565317530771921.png" data-latex="\frac {1} {8}"/>
④
<img class="kfformula" src="20190809/1565317530451678.png" data-latex="\frac {1} {4}"/>
【单选题】
已知<img class="kfformula" src="20190809/1565322050560879.png" data-latex="A\left ( {0,-2} \right )"/>,<img class="kfformula" src="20190809/1565322050489966.png" data-latex="B\left ( {x,6} \right )"/>的中点坐标为<img class="kfformula" src="20190809/1565322050782302.png" data-latex="\left ( {-1,y} \right )"/>,则<img class="kfformula" src="20190809/1565322050701271.png" data-latex="x"/>,<img class="kfformula" src="20190809/1565322050277662.png" data-latex="y"/>的值分别为( )
①
<img class="kfformula" src="20190809/1565322050358526.png" data-latex="x=-4,y=-2"/>
②
<img class="kfformula" src="20190809/1565322050607462.png" data-latex="x=2,y=4"/>
③
<img class="kfformula" src="20190809/1565322050656212.png" data-latex="x=-4,y=25"/>
④
<img class="kfformula" src="20190809/1565322050205695.png" data-latex="x=-2,y=2"/>