Question

Q9). Give reasons(Use key words ) : Mixture of salt and sand cannot be
separated by Sublimation.
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Answer 1

Answer:

Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

Explanation:

Sand and salt can not be separated through the method of sublimation because none of the two can show sublimation(even when heated).

Answer 2

Located about 32 million light-years from Earth in the Messier 74 galaxy (M74), this object emits periodic bursts of x-rays at a rate that suggests it is much larger than a stellar-mass black hole but significantly smaller than the supermassive black holes found at the centers of galaxies.