Consider the molecules h2o, h2s, h2se, and h2te. which do you expect to have the highest boiling point, and why?

The highest boiling point will be of H2O

The given compounds are hydrides of O, S, Se and Te

All of them belongs to same period and the electronegativity of elements in a period decreases on moving down

So oxygen has highest electronegativity among them

Thus H2O is able to form hydrogen bond [ the interaction between a hydrogen bonded to highly electronegative element (F, O or N) and another electronegative element (F, O or N)

This increases the intermolecular interaction between water molecules which make it a high boiling liquid

H2O, because it experiences hydrogen bonding.

Explanation:

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

it is stable as it is in group 0 which have full outer shells of electrons