What is the valency of each of the underlined elements in the following oxides? Take the valency of oxygen to be 2.
(1) SO3
(2) N2O3
(3) SnO2
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Correct option is
B
two and two
Ans. (B) (two and two)
This is because magnesium loses two electrons to have an octet and oxygen gains two electrons to have an octet. The final formula of magnesium oxide is MgO. So, the valencies magnesium and oxygen in MgO are 2 and 2 .
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