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Eamcet Chemistry
1st Year : Unit 1.4 (Basics & Concepts) - Stoichiometric Calculations

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Q.

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

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Correct choice: A

Explanation:

2Mg + O2 → 2 MgO
2moles i.e 2X24 gm of Mg reacts with 1mole i.e 32 gm of Oxygen.
Wt of Mg that reacts with 0.5gm of Oxygen =( 0.5X2X24/32)=0.75gm
Wt of Mg left +1- 0.75 = 0.25gm
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