The second ionisation potential of an element M is the energy required to:a.Remove 2 moles of electrons from one mole of gaseous atomsb.Remove one mole of electron from one mole of gaseous anionc.Remove one mole of electron from one mole of gaseous cation of the elementd.Remove one mole of electron from one mole of monovalent gaseous cation of the element
Question
The second ionisation potential of an element M is the energy required to:a.Remove 2 moles of electrons from one mole of gaseous atomsb.Remove one mole of electron from one mole of gaseous anionc.Remove one mole of electron from one mole of gaseous cation of the elementd.Remove one mole of electron from one mole of monovalent gaseous cation of the element
Solution
The correct answer is c. Remove one mole of electron from one mole of gaseous cation of the element.
Here's why:
The second ionisation potential refers to the energy required to remove a second electron from an atom. The first ionisation potential is the energy required to remove the first electron from a neutral atom, forming a cation (a positively charged ion).
So, the second ionisation potential refers to the energy required to remove an electron from this cation, not from a neutral atom or an anion. Therefore, options a, b and d are incorrect.
In option c, we are removing an electron from a cation of the element, which is exactly what the second ionisation potential refers to. Hence, option c is the correct answer.
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