1. Tardigrade
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  3. Chemistry
  4. The heat of formation of MgO, Al 2 O 3 and SiO 2 are -692,-1676, -911, kJ mol -1. Most stable oxide is:

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Q. The heat of formation of $MgO,\, Al _{2} O _{3}$ and $SiO _{2}$ are $-692,-1676,\, -911,\, kJ\, mol ^{-1}$. Most stable oxide is:

Haryana PMTHaryana PMT 2003

Solution:

A smaller higher charged ion will be closer to the oxide ions $\left( O ^{2-}\right)$, which means the thermal stability of $MgO$ is more or it takes more energy to break the crystal structure of $MgO$