ICSE Class 7 Answered

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Solution for your query:

 

1. PCl₃ : as valency of chlorine is -1 so, the valency of phosphorus is +3.

x + 3(-1) = 0, so x = +3.

 

4. Fe₂O₃  : valency opf oxygen is -2,

 

2(x) + 3(-2) = 0

2x = +6

x = +3

 

Thus, the valency if Fe is +3.

 

 

9. NaHSO₄ :  Here, Na is cation with +1 charge, HSO4 is anion. Whole compound is having zero charge.

1 + x = 0, so x= -1

 

Thus, HSO₄ has -1 charge.

 

Similarly work out for the other species to find out the valencies.

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