Question

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

Answer 1

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 $N{a^ + }$ , ${K^ + }$ , $C{l^ - }$ , $B{r^ - }$ , $HCO_3^ -$, etc. as well as divalent ions such as $M{g^{2 + }}$ , $C{a^{2 + }}$ , $SO_4^{2 - }$.

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 $NO_3^ -$ 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 $ClO_4^ -$ 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 $HCO_3^ -$. 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.