The valency of chlorine in HCl is
A0
B2
C3
D1
Answer & Solution
Correct answer: D. 1
1. The chapter teaches valency from hydrogen combination.
2. Chlorine has 7 electrons in the outer shell.
3. It accepts 1 electron to complete the octet.
4. So chlorine has valency 1, equal to that of hydrogen here.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on valency_
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