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Set 41 — Electrochemistry — Oxidation States
Set 41 — Electrochemistry — Oxidation States
10 questions · 📖 Tutor Mode · ⏱ 15 min
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Electrochemistry — Oxidation States
1 / 10
WAEC 2018
The oxidation state of chromium in K₂Cr₂O₇ is:
A.
+6 (K=+1, O=−2. 2(+1) + 2(Cr) + 7(−2) = 0 → 2 + 2Cr − 14 = 0 → 2Cr = +12 → Cr = +6)
B.
−6
C.
+3
D.
−3
E.
+2
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