Question

The monovalent ion / radical among the following is:
A.Calcium
B.Nitrate
C. perchloride
D.bicarbonate

Answer 1

Hint: In this question, we have to say which among the following are the monovalent ion or radical. Monovalent ion or radicle is a chemical group that has one electron less or more and can form only one covalent bond. Natural water contains monovalent ions such as $N{a}^{+}$ , $K^{+}$ , $C{l}^{-}$ , $B{r}^{-}$ , $HC{O}_3^{-}$, etc. as well as divalent ions such as $M{g}^{2+}$ , $C{a}^{2+}$ , $S{O}_4^{2-}$.

Complete step by step answer:
Now we will discuss the options one by one
The first option is calcium. Calcium forms $C{a}^{2+}$ which is a divalent ion. It has a shortage of two electrons to make it a neutral Ca atom.
The second option is nitrate. Nitrate ion whose chemical formula is $N{O}_3^{-}$ is a monovalent ion with valency 1. It has one extra electron which it can share and form covalent bonds. Nitrate is nitrogen oxoanion formed by the loss of a proton from nitric acid. It is a conjugate base of nitric acid.
The third option is the perchloride. Perchloride ion whose chemical formula is $Cl{O}_4^{-}$ is a monovalent anion and a chlorine oxoanion. It is a conjugate base of perchloric acid. It has a valency 1.
The fourth option is bicarbonate. Bicarbonate whose chemical formula is $HC{O}_3^{-}$. A bicarbonate ion is an intermediate form in the deprotonation of carbonic acid. It is a monovalent ion with valency 1.
After the discussion we can conclude that nitrate, perchloride, bicarbonate are the monovalent ions or radicals.
Thus, the correct option is (B), (C), (D).

Note:
Monovalent ions have a valency of 1. A monovalent cation is an ion carrying a positive charge.
 For example:- $N{a}^{+}$. A monovalent anion is an ion carrying a negative charge. For example:- $C{l}^{-}$
The ions of alkali group metals and halogen groups have monovalent ions.