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Sublimation

The mixture o...

Question

The mixture of X and Y were taken in a condenser flask and were then heated. After keepint it for cooling, crystals of Y were found on the walls of the flask and X was present as such at the bottom of flask. Identify X and Y:

X = N a C l, Y = K C l

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X = A n t h r a c e n e, Y = N a p h t h a l e n e

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X = N a C l, Y = N a p h t h a l e n e

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X = A n t h r a c e n e, Y = N a C l

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Solution

The correct option is C $X = N a C l, Y = N a p h t h a l e n e$
Since crystals of $Y$ were formed on the walls of flask hence it must be some compound which sublimates on heating, and there was no effect on the $X$ so $X$ must be compound with high boiling point. The only combination with these properties are $X = N a C l$ , $Y = N a p h t h a l e n e$

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