Which of the following exhibits variable valency?

N a

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K

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A l

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S

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Solution

The correct option is D $S$
Sulphur $(S)$ exhibits variable valency. It shows valence of 2, 4 and 6. For example, it forms compounds such as $H_{2} S$ (valence 2), $S O_{2}$ (valence 4) and $S O_{3}$ (valence 6).
$N a, K$ and $A l$ have valence of $1, 1$ and $3$ respectively. They do not show variable valence.

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N a - 11, A l - 13, S i - 14, P - 15

Question 11
Which one of the following elements exhibit maximum number of valence electrons?

(a) Na
(b) Al
(c) Si
(d) P

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