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Reported Question / Answer
Q.) The valency of all these ions is negative 2, except
1)
SO<sub>3</sub>
2)
SO<sub>4</sub>
3)
HCO<sub>3</sub>
4)
CO<sub>3</sub>
5)
NULL
Answer :
3
Thank you for reporting wrong Question / Answer / Options
We look forward to your suggestions and feedback.
Message / Correct Answer / Suggestion
Human Verification : Answer 2 + 3 = ?
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