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Question
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
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Solution
Hydrogen chloride [HCl], one atom of chlorine has combined with one atom of hydrogen, and also 1 atom of hydrogen can be replaced by metals like potassium, sodium. Hence valency of chlorine in one.
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