Variable Valency


 
 
Concept Explanation
 

Variable Valency

Variable Valency Some element show more than one type of valency these types of valency are called variable valency. These types of compounds show a valency in one compound and another valency in other compounds. Variable valency is shown  by elements like iron, mercury, and copper. Transition elements show variable valency.

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Sample Questions
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Question : 1

Which of the following element do not have variable valency ?

Right Option : B
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Question : 2

Which of the following statement / statements are correct :

(a) Iron reacts with oxygen to form ferrous oxide.

(b) Iron reacts with oxygen to form ferric oxide.

(c) Iron have variable valency i.e. 1 and 2.

(d) Iron have variable valency i.e. 2 and 3.

Right Option : D
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Question : 3

Which of the following statement / statements are correct :

(a) Copper have variable valency.

(b) Oxygen do not have variable valency.

(c) Neon have variable valency.

(d) Iron have variable valency.

Right Option : D
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