MCQ
Which of the following is/are covalent binary compound $(s)\ ?$
- ✓$\ce{BF_3}$
- B$\ce{KBr}$
- C$\ce{CaI_2}$
- D$\ce{AlF_3}$
✓
Answer
Correct option: A.
$\ce{BF_3}$
A binary compound is a compound composed of only two elements i.e., a binary compound is made from exactly two different elements. There are two types of binary compounds.
Ionic binary compound : Binary compound which is formed by the combination of a metal atom and non metal atom is called ionic binary compound, e.g., $\ce{KBr, NaCl},\mathrm{CaI}_2, \mathrm{AlF}_3, \mathrm{MgBr}_2$.
Covalent binary compound: Binary compound which is formed by the combination of two non metal atoms is called binary covalent compound. In binary covalent compound sharing of electrons takes place, e.g., $\mathrm{BF}, \mathrm{N}_2 \mathrm{O}, \mathrm{P}_2 \mathrm{O}_5, \mathrm{~N}_2 \mathrm{H}_4, \mathrm{CH}_4$ and $\mathrm{H}_2 \mathrm{O}$.
Binary compound formed by $\ce{B}$ and $\ce{F}$ is $\ce{BF_3}$ in which both boron $\ce{(B)}$ and florine $\ce{(F)}$ are non metals, hence, it is covalent binary compound.
Binary compound formed by $K$ and $\ce{Br}$ is $\ce{KBr}$ in which potassium $\ce{(K)}$ is metal and bromine $\ce{(Br)}$ is non metal. Hence, its is ionic binary compound.
Ionic binary compound : Binary compound which is formed by the combination of a metal atom and non metal atom is called ionic binary compound, e.g., $\ce{KBr, NaCl},\mathrm{CaI}_2, \mathrm{AlF}_3, \mathrm{MgBr}_2$.
Covalent binary compound: Binary compound which is formed by the combination of two non metal atoms is called binary covalent compound. In binary covalent compound sharing of electrons takes place, e.g., $\mathrm{BF}, \mathrm{N}_2 \mathrm{O}, \mathrm{P}_2 \mathrm{O}_5, \mathrm{~N}_2 \mathrm{H}_4, \mathrm{CH}_4$ and $\mathrm{H}_2 \mathrm{O}$.
Binary compound formed by $\ce{B}$ and $\ce{F}$ is $\ce{BF_3}$ in which both boron $\ce{(B)}$ and florine $\ce{(F)}$ are non metals, hence, it is covalent binary compound.
Binary compound formed by $K$ and $\ce{Br}$ is $\ce{KBr}$ in which potassium $\ce{(K)}$ is metal and bromine $\ce{(Br)}$ is non metal. Hence, its is ionic binary compound.
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