Answer:solution
Step-by-step explanation:
Solution
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Correct option is C)
X - No. of electrons in valence shell - 5 
 Electrons required for octet configuration - 3 (valency =3)
Y - No. of electrons in valence shell - 7
 Electrons required for octet configuration - 1 (valency =1)
 X⟶3
 Y⟶1
 XY3
The compound formed by a combination of X and Y is XY3.
Hence, the correct option is C
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