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二硫化钨(WS2,WS2中W的化合价为+4)可用作润滑剂及石油化工领域中的催化剂.由钨铁矿(其主要成分是FeWO4,还含少量Al2O3)制备二硫化钨的工艺流程如图: 请回答下列问题: (1)已知:...
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高三下学期化学《》真题及答案
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三氧化二铬Cr2O3可用作油漆颜料Cr2O3中Cr的化合价是
-3
-2
+2
+3
硅酸钠Na2SiO3可用作粘合剂和防火材料其中硅元素的化合价为
+1
+2
+3
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二氧化锡SnO2可用作液晶元件电极其中氧元素为—2价则锡元素的化合价为
+1
+2
+3
+4
二氧化锡SnO2可用作液晶元件电极其中氧元素为-2价则锡元素的化合价为
+1
+2
+3
+4
二氧化锡SnO2可用作液晶原件电极其中氧元素为-2价则锡元素的化合价为
+1
+2
+3
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白钨矿主要成分为CaWO4是一种重要的矿物CaWO4中钨元素W.的化合价是
+6
+4
+2
-2
钨是熔点最高的金属广泛应用于拉制灯丝有光明使者的美誉冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaW
-6
+4
+6
+7
硅酸钠Na2SiO3可用作黏合剂和防火材料硅酸钠中硅元素的化合价为
+1
+2
+3
+4
二氧化铅PbO2用作电动车电池的电极该物质中氧元素为-2价则铅元素的化合价为
+2
+4
-2
-4
FeSO4常用作维生素片中的铁补充剂若Fe的化合价为+2则S.的化合价是
+6
+4
0
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厦钨股份正在研究和利用的白钨矿其有效成分CaWO4中钨元素W.的化合价为
+2
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+6
+7
硅酸钠Na2SiO3可用作粘合剂和防火材料硅酸钠中硅元素的化合价为
+4
+3
+2
+1
白钨矿的主要成分是钨酸钙CaWO4其中钨元素W.的化合价是
+2
+3
+6
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硅酸钠Na2SiO3可用作粘合剂和防火材料硅酸钠中硅元素的化合价为
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冶炼金属钨常用白钨矿石其主要成分钨酸钙CaWO4中钨W.的化合价为
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+7
-6
硅酸钠Na2SiO3可用作粘合剂和防火材料硅酸钠中硅元素的化合价是
+1
+2
+3
+4
硅酸钠Na2SiO3可用作粘合剂和防火材料硅酸钠中硅元素的化合价为
+1
+2
+3
+4
硅酸钠Na2SiO3可用作粘合剂和防火材料硅酸钠中硅元素的化合价为
+l
+2
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冶炼金属钨常用到白钨矿石其主要成分是钨酸钙CaWO4钨酸钙中钨W的化合价为
-6
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根据FeS2+O2—→Fe2O3+SO2回答下列问题1氧化剂________还原剂________氧
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