JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Topic Test - Some Basic Concepts of Chemistry (8-5-21)

\[1.5\] mol of \[{{O}_{2}}\] combine with \[Mg\] to form oxide \[MgO\]. The mass of \[Mg\] (at. mass 24) that has combined is

A) \[72\ g\]

B) \[36\ g\]

C) \[48\ g\]

D) \[24\ g\]

Correct Answer: A

Solution :

[a] \[\underset{1\text{mole}}{\mathop{Mg}}\,+\underset{0.5\text{mole}}{\mathop{\frac{1}{2}{{O}_{2}}}}\,\to MgO\]

0.5 mole of oxygen react with 1 mole of Mg

1.5 mole of oxygen react with \[\frac{1.5}{0.5}=3\]mole

\[24\times 3=72gm\].