PERSIAPAN PAS KELAS XII TA 2023 - 2024
Quiz
•
Chemistry
•
12th Grade
•
Practice Problem
•
Easy
DWI MAHMUDA
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16 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Bilangan oksidasi unsur yang dicetak tebal dalam senyawa S₂O₃2- adalah… .
- 2
+ 2
- 4
+ 4
+ 6
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Diketahui beberapa reaksi berikut :
(1) MnO4- → MnO2
(2) Zn → Zn2+ + 2e-
(3) Cr2O72- → Cr2O32-
(4) C2O42- → 2CO2 + 2e-
Peristiwa oksidasi pada pasangan reaksi dengan nomor … .
1 dan 2
1 dan 3
1 dan 4
2 dan 3
2 dan 4
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Persamaan reaksi redoks:
a Fe2+ + b MnO4- + c H+ → Fe3+ + Mn2+ + d H2O
Harga koefisien a, b, c, dan d berturut-turut adalah ....
5, 1, 4, dan 2
5, 1, 4, dan 8
5, 1, 8, dan 4
5, 1, 2, dan 4
4, 8, 1, dan 5
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Perhatikan gambar sel volta berikut!
Berdasarkan gambar rangkaian tersebut, diagram sel yang tepat adalah.....
Mg2+ | Mg || Cu | Cu2+
Mg2+ | Mg || Cu2+ | Cu
Mg | Mg2+ || Cu | Cu2+
Mg | Mg2+ || Cu2+ | Cu
Cu2+ | Cu || Mg | Mg2+
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Tegangan suatu sel, yang setengah sel-selnya diberikan di bawah ini :
Cu2+ + 2e- -> Cu Eo = + 0,34 volt
Pb2+ + 2e- -> Pb Eo = − 0,13 volt
ialah... .
− 0,47 volt
− 1,35 volt
– 0,21 volt
+ 0,21 volt
+ 0,47 volt
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Berikut ini harga potensial elektroda besi dan tembaga:
Fe2+ (aq) + 2e- -> Fe (s) E° = - 0,44 volt
Cu2+ (aq) + 2e- -> Cu (s) E° = + 0,34 volt
Diagram sel yang tepat untuk berlangsungnya reaksi tersebut adalah ....
Fe | Fe2+ || Cu | Cu2+
Fe2+ | Fe || Cu | Cu2+
Cu | Cu2+ || Fe2+ | Fe
Fe | Fe2+ || Cu2+ | Cu
Cu+ | Cu || Fe | Fe2+
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Perhatikan gambar berikut!
Eo Zn2+ | Zn Eosel = – 0,76 volt
Eo Cu2+ | Cu Eosel = + 0,34 Volt
Berdasarkan rangkaian sel elektrokimia di atas, elektron mengalir dari … .
Seng ke tembaga dan massa seng meningkat
Seng ke tembaga dan massa tembaga meningkat
Tembaga ke seng dan massa seng meningkat
Tembaga ke seng dan massa tembaga meningkat
Tembaga ke seng dan massa seng tetap
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