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Ionic Bond

Two elements ...

Question

Two elements A and B have valencies of 5 and 3, and 3 and 2, respectively. The elements A and B are most likely to be respectively:

A

Sulphur and iron

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B

Phosphorous and nitrogen

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C

Nitrogen and iron

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D

Sodium and sulphur

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Solution

The correct option is C
Nitrogen and iron

Nitrogen (A) shows valencies: 5 and 3

Iron (B) shows valencies: 3 and 2.

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