SUMATIF AKHIR SEMESTER OLIMPIADE KIMIA (PAKET 7)
10th Grade
•25 Qs
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SUMATIF AKHIR SEMESTER OLIMPIADE KIMIA (PAKET 7)
Quiz
•
Chemistry
•
10th Grade
•
Practice Problem
•
Easy
laila maghfiroh
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25 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Pada reaksi Fe2+ + MnO4- → Fe3+ + Mn2+, pernyataan yang benar adalah ....
A. Fe2+ merupakan oksidator
B. Mn merupakan reduktor
C. bilangan oksidasi Mn dari +7 menjadi +2
D. bilangan oksidasi Mn dari +2 menjadi +7
E. setengah reaksi oksidasinya MnO4- → Mn2+
2.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Diketahui beberapa reaksi berikut :
(1) MnO4- → MnO2
(2) Zn → ZnO2–
(3) 2CO2 → C2O42-
(4) Cr2O3 → Cr2O72-
Peristiwa oksidasi pada pasangan reaksi dengan nomor ….
A. 1 dan 2
B. 1 dan 3
C. 1 dan 4
D. 2 dan 3
E. 2 dan 4
3.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Koefisien a, b, dan c yang tepat untuk setengah reaksi
aCr2O72- + bH+ + e- → Cr3+ + cH2O adalah ….
A. 1, 14, 7
B. 2, 14, 7
C. 1, 7, 14
D. 2, 7, 14
E. 2, 7, 16
4.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Unsur logam yang mempunyai bilangan oksidasi +5 terdapat pada ion ....
A. SbO43-
B. MnO4-
C. Fe(CN)63-
D. CrO42-
E. Cr2O72-
5.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Diantara senyawa-senyawa berikut, senyawa mangan yang mempunyai bilangan oksidasi tertinggi adalah ....
A. MnO
B. MnO2
C. MnSO4
D. KMnO4
E. K2MnO4
6.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Pada reaksi redoks 3Cl2 + 6NaOH → 5NaCl + NaClO3 + 2H2O. Bilangan oksidasi atom Cl berubah dari ....
A. +1 menjadi -1
B. -1 menjadi +1
C. 0 menjadi -1
D. 0 menjadi -1 dan +5
E. 0 menjadi -1 dan +7
7.
MULTIPLE CHOICE QUESTION
5 mins • 4 pts
Diantara reaksi redoks berikut ini yang sudah setara adalah…
A. 4H2O + MnO4- + 6I- → 2MnO2 + 8OH– + 3I2
B. 3P + 5NO3- + 4OH- → 3PO43- + 2H2O + 5NO
C. Cl2 + 2OH- + IO3- → 2Cl– + IO4- + 2H2O
D. 11OH– + 6Cl2 → 10Cl– + 2ClO3- + 6H2O
E. 8MnO4 + 3NH3 → 8MnO2 + 2H2O + 5OH- + 3NO3-
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