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An element A has valencies equal to 3 and 5. It combines with another element B having valency equal to 2. What are formulae of the compounds thus formed?

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$A_{2} B_{3}$ and $A_{3} B_{5}$

$A_{2} B_{3}$ and $A_{2} B_{5}$

$A_{3} B_{2}$ and $A_{5} B_{2}$

$A_{5} B_{3}$ and $A_{2} B_{5}$

answer is C.

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Detailed Solution

imagine A as nitrogen or phosphorus you will have idea of compounds ie $N_{2} O_{3}, N_{2} O_{5}$

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