The first ionisation enthalpies (kj/mol)for Li ,Be ,B and C have one of the following values. Which of these corresponds to that of boron ?

520

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1086

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899

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800

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Solution

The correct option is C
899

Ionisation energies of Li ,Be ,B and C are in the order Li < Be <B <C.

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An element X is having the first ionisation enthalpy as 496kJ/mol. It is having second ionisation enthalpy as 4564kJ/mol. While it is having third ionisation enthalpy as 6918kJ/mol. And accordingly the fourth ionisation enthalpy is 9542kJ/mol. Find the formula of the sulphate and chloride of the element.

Plz explain with the reason

Q. Ionisation potential values of Li, Be and B are respectively in kJ