Answer :

i) H2O

Valency of oxygen is 2


Let the valency of oxygen is x


We know that,


Charge on hydrogen is +1


Therefore, 21 + x = 0


2+x=0


x= -2


As the picture shows,



ii) KCl


Valency of potassium is 1


Let the valency of potassium is x


We know that,


Charge on chlorine is -1


Therefore, x + (-1) = 0


x – 1 =0


x= 1


As the picture shows,



iii) Al2O3


Valency of aluminium is 3


Let the valency of aluminium is x


We know that,


Charge on oxygen is -2


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


2x – 6 =0


2x= 6


x =


x = 3


iv) Fe2O3


Valency of iron is 3


Let the valency of iron is x


We know that,


Charge on oxygen is -2


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


2x – 6 =0


2x= 6


x =


x = 3


v) CH4


Valency of carbon is 4


Let the valency of carbon is x


We know that,


Charge on hydrogen is +1


Therefore, x+41 = 0


x+4=0


x= -4


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