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Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The element X and Y are most likely to be respectively :

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Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The element X and Y are most likely to be respectively :
A. copper and calcium
B. sulphur and iron
C. phosphorus and nitrogen
D. nitrogen and iron

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Correct Answer - D
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