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Q.

Element X is a metal with a valency 2, Y is a non-metal with a valency 3. If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.


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a

Question Image

b

Question Image

c

Question Image

d

Question Image 

answer is A.

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Detailed Solution

Concept- First, we must produce anion and cation. To make a compound, double the valency by two. Metal and nonmetal should be written in their natural condition. Create equations with natural elements as reactants and ultimate compounds as products.
Since element Question Image is metal, it will form cation by giving 2 electrons, as valency is 2 .
Question ImageSince element Question Image is non-metal, it will form anion by accepting 3 electrons, as valency is 3 .
Question ImageSince we know valency so we will cross multiply valency to get compound, Question ImageSince Question Image is metal so it will be monatomic, and Question Image is diatomic gas so natural state will be Question ImageThus overall equation is:
Question ImageHence, the correct option is 1.
 
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