First slide

Periodic Trends

Question

Electron gain enthalpy values of the first four chalcogens are randomly given as -200 kJ/mole , -141 kJ/mole , -190 kJ/mole and
-195 kJ/mole. Electron gain enthalpy of sulphur will be

Easy

A

-190 kJ/mole
B

-195 kJ/mole
C

-200 kJ/mole
D

-141 kJ/mole

Solution

Electron gain enthalpy of O(-141 kJ/mole)<S(-200 kJ/mole)<Se(-195 kJ/mole)<Te(-190 kJ/mole);
Due to small size and inter electronic repulsions EGE of oxygen very less;

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