甲醛(化学式CH2O)是室内装潢时的主要污染物之一。下列说法中正确的是( )

常见元素和原子团的化合价

Quiz
•
Chemistry
•
8th Grade
•
Medium

xi yang
Used 6+ times
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A.甲醛分子由碳、氢、氧三种元素组成
B.甲醛分子由碳原子、氢气分子、氧原子构成
C.甲醛由一个碳元素、2个氢元素、一个氧元素组成
D.一个甲醛分子由一个碳原子、两个氢原子、一个氧原子构成
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
扬州推广“LED”绿色节能光源。砷化镓(GaAs) 是光源材料,Ga为+3价,As的化合价为( )
-3
-5
+3
+5
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
次氯酸钙[Ca(ClO)2]能起杀菌、消毒作用,其中钙元素的化合价为+2,氧元素的化合价为-2,则氯元素的化合价是
+1
-1
+2
-2
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
求出KMnO4中Mn的化合价
+6
-6
+7
-7
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
求出K2MnO4中Mn的化合价
+5
+6
+7
+8
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
试确定氯酸钾(KClO3)中氯元素的化合价
+3
+4
+5
+6
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
求出H2SO4中S的化合价
+4
+5
+6
+7
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