Periodicity
question 1 of 3
Grade: Form 3
Q: Sulphur and selenium are all in the same group of the Periodic Table. From this we would expect selenium to form compounds having the formula... A) SeO₂, Na₂Se and Na₂SeO₃ B) Se₂O, Na₂Se and NaSeO₄ C) SeO₂, Na₂Se and NaSeO₄ D) SeO₃, NaSe and NaSeO₃
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Did You Know?
At the anode in dilute NaOH: 4OH⁻ → O₂ + 2H₂O + 4e⁻. At the anode in molten KI: 2I⁻ → I₂ + 2e⁻. Both are oxidation reactions (loss of electrons).
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