【单选题】
判断反应Fe＋2HCl===<img class="kfformula" src="20200708/1594170364547268.png" data-latex="{H}_{2}\uparrow +{FeCl}_{2}" width="107" height="30"/>的反应类型（ ）。
①
复分解反应
②
化合反应
③
氧化还原
④
中和反应
【单选题】
P单质在反应<img class="kfformula" src="20200629/1593418632407394.png" data-latex="4P+3KOH+{3H}_{2}O==={3KH}_{2}{PO}_{2}+{PH}_{3}" width="297" height="34"/>中的变化是( )。
①
既被氧化又被还原
②
被氧化
③
既未被氧化又未被还原
④
被还原
【单选题】
<img class="kfformula" src="20190808/1565256388580621.png" data-latex="{25}^{\frac {3} {2}}="/>（ ）
①
5
②
125
③
25
④
50
【单选题】
对<img class="kfformula" src="20200624/1592993427842684.png" data-latex="{1mo1H}_{2}0" width="89" height="31"/>的说法正确的是（ ）。
①
含有<img class="kfformula" src="20200624/1592993427214801.png" data-latex="{6.02\times 2\times 10}^{23}" width="135" height="33"/>氢元素
②
氢原子与氧原子的物质的量之比为2:1
③
含有<img class="kfformula" src="20200624/1592993427231085.png" data-latex="{6.02\times 10}^{23}" width="81" height="31"/>个氢分子
④
质量为18g
【单选题】
等差数列<img class="kfformula" src="20190809/1565315219717157.png" data-latex="\left \{ {{a}_{n}} \right \} "/>首项<img class="kfformula" src="20190809/1565315219801596.png" data-latex="{a}_{1}=1"/>，公差<img class="kfformula" src="20190809/1565315219560191.png" data-latex="d=-3"/>，当<img class="kfformula" src="20190809/1565315219192999.png" data-latex="{a}_{n}=-56"/>时，项数<img class="kfformula" src="20190809/1565315219715609.png" data-latex="n"/>等于（ ）
①
18
②
19
③
20
④
21
【单选题】
标准状况下,<img class="kfformula" src="20200624/1592990307419690.png" data-latex="{0.4moIH}_{2}" width="93" height="29"/>和<img class="kfformula" src="20200624/1592990307965598.png" data-latex="{0.6mo10}_{2}" width="95" height="34"/>的混合气体的体积为（ ）L。
①
无法计算
②
11.2
③
22.4
④
1
【单选题】
<img class="kfformula" src="20190730/1564475645410465.png" data-latex="{5}^{-1}"/>等于（）
①
<img class="kfformula" src="20190730/1564475645509248.png" data-latex="-\frac {1} {5}" width="96" height="63"/>
②
<img class="kfformula" src="20190730/1564475645473521.png" data-latex="\frac {1} {5}" width="94" height="63"/>
③
<img class="kfformula" src="20190730/1564475645939907.png" data-latex="-5"/>
④
<img class="kfformula" src="20190730/1564475645707520.png" data-latex="5"/>
【单选题】
计算１<img class="kfformula" src="20200624/1592985109154466.png" data-latex="{molCO}_{2}" width="102" height="28"/>的质量是（ ）g。
①
8
②
12
③
33
④
44
【单选题】
正五棱锥的底面积是<img class="kfformula" src="20190809/1565328530277328.png" data-latex="26{cm}^{2}"/>，高是<img class="kfformula" src="20190809/1565328530106797.png" data-latex="6cm"/>，则其体积是（ ）。
①
<img class="kfformula" src="20190809/1565328531591499.png" data-latex="104{cm}^{3}"/>
②
<img class="kfformula" src="20190809/1565328531884474.png" data-latex="{52cm}^{3}"/>
③
<img class="kfformula" src="20190809/1565328531242148.png" data-latex="78{cm}^{3}"/>
④
<img class="kfformula" src="20190809/1565328531496628.png" data-latex="156{cm}^{3}"/>
【单选题】
在等差数列<img class="kfformula" src="20190809/1565316326247415.png" data-latex="\left \{ {{a}_{n}} \right \} "/>中，<img class="kfformula" src="20190809/1565316326513469.png" data-latex="{a}_{1}=2"/>，<img class="kfformula" src="20190809/1565316326731066.png" data-latex="d=-2"/>，则前十项的和为（ ）
①
-90
②
-70
③
110
④
220
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