Which radical has valency 2?
ACarbonate, CO3 2-
BHydroxide, OH -
CNitrate, NO3 -
DAmmonium, NH4 +
Answer & Solution
Correct answer: A. Carbonate, CO3 2-
1. The chapter lists radical valencies in a table.
2. Hydroxide, nitrate, ammonium all carry charge 1.
3. Carbonate carries charge 2 (CO3 2-).
4. Hence carbonate has valency 2.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on radicals_
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