Question

Assertion(A): On heating iodine crystal iodine vapours are formed.
Reason(R): lodine easily undergoes sublimation. (1m)
Both A and R are true and Ris the correct explanation of A.
Both A and Rare true but Ris not the correct explanation of A.
A is true but Ris false.
Ais false but Ris true

Answer 1

When iodine sublimes it forms a visible purple gas. When the gas cools it returns directly to the solid phase, an example of deposition. When solid iodine crystals are heated (in a beaker with hot sand) the iodine will change from a solid directly to a gas without passing through a liquid phase.

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