Which of these oxidation states is correct?
A Chlorine in Cl₂ is -1
B Chromium in K₂Cr₂O₇ is +7
C Fluorine in F₂O is -1
D Hydrogen in NaH is +1 - AQA - A-Level Chemistry - Question 10 - 2022 - Paper 3
Question 10
Which of these oxidation states is correct?
A Chlorine in Cl₂ is -1
B Chromium in K₂Cr₂O₇ is +7
C Fluorine in F₂O is -1
D Hydrogen in NaH is +1
Worked Solution & Example Answer:Which of these oxidation states is correct?
A Chlorine in Cl₂ is -1
B Chromium in K₂Cr₂O₇ is +7
C Fluorine in F₂O is -1
D Hydrogen in NaH is +1 - AQA - A-Level Chemistry - Question 10 - 2022 - Paper 3
Step 1
A Chlorine in Cl₂ is -1
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Answer
In Cl₂, chlorine typically has an oxidation state of 0 because it is in its elemental form.
Step 2
B Chromium in K₂Cr₂O₇ is +7
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Answer
In potassium dichromate (K₂Cr₂O₇), chromium is in the +6 oxidation state, not +7.
Step 3
C Fluorine in F₂O is -1
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Answer
In F₂O, fluorine has an oxidation state of -1 due to its strong electronegativity.
Step 4
D Hydrogen in NaH is +1
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Answer
In sodium hydride (NaH), hydrogen has an oxidation state of -1 as it is bonded to a metal.
