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Electron affinity across a period.

Electron affinity increases across a period in a similar manner as ionization energy. However, the electron affinity values are smaller than those in ionization energy since the electron removal from negative ions is easier than removal from neutral ions

Catalytic activity of transition elements

Transition elements are good homogeneous and heterogeneous catalysts. This is because they are able to form numerous oxidation state and are able to form unstable intermediate compound during a reaction providing an alternative route with a lower activation energy. Vanadium (v) oxide V2O5 is used in oxidation of SO2 to SO3 in contact process( industrialContinue reading “Catalytic activity of transition elements”

In terms of structure and bonding, explain why Hydrogen sulphide exist in gaseous state ( low boiling point) while water exist in liquid form ( high boiling point) ?

Both water and hydrogen sulphide gas have molecular structures or are molecular substances (made up of molecules) . For molecular substances, increase in molecular mass leads to increase in melting point and boiling point. Water has a molecular mass of 18g/mol and hydrogen sulphide has a molecular mass of 34g/mol , so it is expectedContinue reading “In terms of structure and bonding, explain why Hydrogen sulphide exist in gaseous state ( low boiling point) while water exist in liquid form ( high boiling point) ?”