Question

Weight of crucible + weight of magnesium wire = X (before heating)
Weight of crucible + weight product magnesium oxide = Y (after heating)
Which of the following option is correct?

A

X = Y

B

X < Y

C

X > Y

D

Depends on element

Easy

Solution

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Correct option is B)

Magnesium wire() on heating in air gains weight due to the formation of magnesium oxide ( ).  It is shown by the following reaction.
So according to the law of conservation of mass, Mass of reactant = Mass of product.
So, 
         

The above equation indicates that the mass of X is less than that of Y. i.e.
Hence, option is correct.

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