Which statement about chloride ions is not correct?
A - AQA - A-Level Chemistry - Question 8 - 2021 - Paper 3
Question 8
Which statement about chloride ions is not correct?
A. They form a white precipitate with silver nitrate solution that is soluble in dilute aqueous ammonia.
B. The... show full transcript
Worked Solution & Example Answer:Which statement about chloride ions is not correct?
A - AQA - A-Level Chemistry - Question 8 - 2021 - Paper 3
Step 1
A. They form a white precipitate with silver nitrate solution that is soluble in dilute aqueous ammonia.
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Answer
This statement is correct. Chloride ions react with silver nitrate to form a white precipitate of silver chloride ( ext{AgCl}), which is soluble in dilute ammonia.
Step 2
B. They form an octahedral cobalt(iii) complex when aqueous cobalt(iii) ions are reacted with an excess of chloride ions.
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Answer
This statement is not correct. Chloride ions do not form an octahedral complex with cobalt(iii) ions as they are not involved in complex formation in this context.
Step 3
C. They form when chlorine reacts with potassium bromide solution.
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Answer
This statement is correct. Chlorine ( ext{Cl}_2) can react with potassium bromide ( ext{KBr}) to form potassium chloride ( ext{KCl}) and bromine ( ext{Br}_2).
Step 4
D. They have the electron configuration 1s²2s²2p⁶3s²3p⁶.
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Answer
This statement is correct as the electron configuration corresponds to the noble gas configuration of argon, which is the stable configuration of chloride ions after gaining an extra electron.
