KCET · Chemistry · Chemical Bonding and Molecular Structure
The electronic configuration of X and Y are given below:
\(\begin{aligned}
& \text { X: } 1 s^2 2 s^2 2 p^6 3 s^2 3 \mathrm{p}^3 \\
& \text { Y: } 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^6 3 \mathrm{~s}^2 3 \mathrm{~s}^5
\end{aligned}\)
Which of the following is the correct molecular formula and type of bond formed between X and Y ?
- A \(\mathrm{X}_3 \mathrm{Y}\), ionic bond
- B \(\mathrm{X}_2 \mathrm{Y}_3\), coordinate bond
- C \(\mathrm{XY}_3\), covalent bond
- D \(\mathrm{X}_2 \mathrm{Y}\), covalent bond
Answer & Solution
Correct Answer
(C) \(\mathrm{XY}_3\), covalent bond
Step-by-step Solution
Detailed explanation
\(\begin{aligned}
& x: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \Rightarrow p \\
& y: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 \Rightarrow \mathrm{Cl}
\end{aligned}\)
Valency of \(\mathrm{p}=3\) or 5
Valency of \(\mathrm{Cl}=1\)
Possible molecules are \(\mathrm{PCl}_3\) or \(\mathrm{PCl}_5\)
Both are covalent
& x: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^3 \Rightarrow p \\
& y: 1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 \Rightarrow \mathrm{Cl}
\end{aligned}\)
Valency of \(\mathrm{p}=3\) or 5
Valency of \(\mathrm{Cl}=1\)
Possible molecules are \(\mathrm{PCl}_3\) or \(\mathrm{PCl}_5\)
Both are covalent
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