Question

Which of the following elements has highest valency with respect to oxygen ? (a) chlorine. (b) magnesium (c) sodium (d) sulphur

Answer 1

it is chlorine, in Cl2O7 the valency of Cl is 7
in case of S, SO3 > valency of S is 6
in case of Mg, MgO > valency of Mg is 2
in case of Na, Na2O > valency of Na is 1

Answer 2

Option (a) - Chlorine has the highest valency with respect to oxygen.

Explanation:

• To find the valency, the compound which is formed due to reaction of oxygen with the given elements must be identified.
• Accordingly, when oxygen reacts with elements such as chlorine, magnesium, sodium and sulfur are as follows:

1. $Cl+O_2\rightarrow Cl_2O_7$
2. $Mg+O_2\rightarrow Mg_2O$
3. $Na+O_2\rightarrow Na_2O$
4. $S+O_2\rightarrow SO_3$

• When the subscripts are cross multiplied, the valency of the elements are obtained.
• Accordingly, the valency of obtained oxides are as follows:

1. $Cl_2O_7 = Cl^7 , O^2$
2. $Mg_2O = Mg, O^2$
3. $Na_2O = Na, O^2$
4. $SO_3 = S^3, O$

• From the above data, it is clear that, chlorine has highest valency with respect to oxygen.

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