The inorganic substance that has a melting point of -101°C and a boiling point of -35°C is chlorine (option A).
Melting point is the temperature at which the solid and liquid phases of a substance are in equilibrium.
On the other hand, the boiling point is the temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
Chemical elements and compounds have specific boiling and melting points that distinguishes them chemically.
The following are the melting and boiling point of the given compound and elements respectively;
Therefore, the inorganic substance that has a melting point of -101°C and a boiling point of -35°C is chlorine.
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