Answer :

i) H_{2}__O__

Valency of oxygen is 2

Let the valency of oxygen is x

We know that,

Charge on hydrogen is +1

Therefore, 2⨉1 + x = 0

2+x=0

x= -2

As the picture shows,

ii) __K__Cl

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) __Al___{2}O_{3}

Valency of aluminium is 3

Let the valency of aluminium is x

We know that,

Charge on oxygen is -2

Therefore, 2⨉x + 3⨉(-2) = 0

2x – 6 =0

2x= 6

x =

x = 3

iv) __Fe___{2}O_{3}

Valency of iron is 3

Let the valency of iron is x

We know that,

Charge on oxygen is -2

Therefore, 2⨉x + 3⨉(-2) = 0

2x – 6 =0

2x= 6

x =

x = 3

v) __C__H_{4}

Valency of carbon is 4

Let the valency of carbon is x

We know that,

Charge on hydrogen is +1

Therefore, x+4⨉1 = 0

x+4=0

x= -4

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