Question

If the reaction 2HgO --> 2Hg + O2 is endothermic, which bonds are the strongest?

The bonds between Hg atoms in the solid metal.
The bond between Hg & O.
The bond between O & O.

Answer 1

• Endothermic reaction means the reactant side takes heat from surrounding and get decomposed i.e ∆H=-ve
• If the equation is exothermic then it means the reactant is happy to decompose .But it's not as it's endothermic

Now

• HgO is Omitted from our solution option.

Hg is a atom so no bonds hence no bond strength occurs.

• O_2 is a molecule and so it's our answer .