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Q.

Electrovalency of metal and non-metal are same in

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a

Potassium sulphide

b

Calcium oxide

c

Magnesium chloride

d

Sodium nitride

answer is C.

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Detailed Solution

Calcium oxide is CaO. The ions present in it are Ca2+ and O2- ;

Thus electrovalency of calcium and oxygen is 2 ;

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