以下哪種或哪些還原劑可把酸化高錳酸鉀褪色?
(1) 硫酸鐵(II)溶液
(2) 硫酸鋅溶液
(3) 二氧化硫
氧化還原反應
Quiz
•
Chemistry
•
10th Grade
•
Hard
Siu Law
Used 23+ times
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8 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
以下哪種或哪些還原劑可把酸化高錳酸鉀褪色?
(1) 硫酸鐵(II)溶液
(2) 硫酸鋅溶液
(3) 二氧化硫
只有(1)
只有(2)
只有(1)和(3)
只有(2)和(3)
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
HSO4-中的硫的氧化數是多少?
+2
+4
+6
-2
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
參照以下方程式:
3CuO(s) + 2NH3(g) → 3Cu(s) + N2(g) + 3H2O(l)
以下哪項或哪些陳述正確?
(1) 氨氣作為氧化劑。
(2) 氮的氧化數由-3變為0。
(3) 銅的氧化數由+2變為0。
只有(1)
只有(2)
只有(1)和(3)
只有(2)和(3)
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
以下的平衡方程式中,x、y和z的數值是多少?
2MnO4-(aq) + xBr-(aq) + yH+(aq) → 2Mn2+(aq) + 5Br2(aq) + zH2O(l)
x: 2 y: 2 z: 1
x: 10 y: 8 z: 4
x: 5 y: 8 z: 4
x: 10 y: 16 z: 8
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
以下哪項方程式中畫有底線的反應物進行還原反應?
PbO(s) + CO(g) → Pb(s) + CO2(g)
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
2H2S(g) + SO2(g) → 3S(s) + 2H2O(l)
KClO(aq) + SO2(g) + H2O(l) → KCl(aq) + H2SO4(aq)
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
以下哪種化合物中的氮的氧化數最大?
N2H4
NO
HNO
N2O5
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
以下的離子半方程式中 y 的值是多少?
Cr2O72-(aq) + 14H+(aq) + ye- → 2Cr3+(aq) + 7H2O(l)
2
4
6
8
8.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
某氧化還原反應中,溴離子按以下方程式在酸性介質下被轉化為溴水。
BrO3-(aq) + H+(aq) + e- → Br2(aq) + H2O(l)
要平衡離子半方程式,需要H+(aq) 和H2O(l) 的數目是多少?
H+(aq): 3 H2O(l): 6
H+(aq): 6 H2O(l): 3
H+(aq): 6 H2O(l): 12
H+(aq): 12 H+(aq):6
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