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Q.

What is the valency of phosphorus in P H 3  


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a

−1  

b

+2  

c

+3  

d

−4   

answer is C.

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Detailed Solution

Concept- The phosphorus is a non-metal that is present just below nitrogen in the group 15 of the periodic table. This element exists in different forms, from which the white and red are the best known.
The number of hydrogen that can combine or replace with another atom in order to form compounds or molecules.
When the chemical compound or molecules are formed, the measure of  combining the power of its elements is known as valence or valency of an element
In P H 3  , P   is combined with 3 H  
Hence, the valency of phosphorus is +3  
Hence, the correct option is 3.
 
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