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Q.

1 gm of Mg is burnt in a vessel containing 0.5 g of oxygen. The reactant remaining unreacted is

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a

0.1 g of O2

b

0.75 g of mg

c

0.1g of Mg

d

0.25g of Mg

answer is A.

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Detailed Solution

\large 2\;Mg\;+\;O_2\;\rightarrow \;2MgO

 

 

2 X 24g          32g

0.75g            0.5g

The reactant remains unreacted= 1-0.75=0.25g

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