s-electrons of the valence shell of some elements show reluctance in bond formation. Such elements are — and belong to — :
Which of the following ions has the most negative value of enthalpy of interaction with water?
Solution
Amongst the ions carrying same charge, the smallest one will have the greatest hydration energy (most negative).
The second ionization potential of an element M is the energy required to
Solution
F2 has highest electronegativity,so it is chemically most active non metal.
Successive addition of electronic shells in case of elements of 17th group causes a increase in
The incorrect statement among the following is
Solution
IE2 of Mg is lower than that of Na because in case of Mg+, 3s-electron has to be removed whereas in case of Na+, an electron is removed from the stable inert gas configuration which is difficult.
Consider the following changes
A ⟶ A+ + e– : E1 and A+ ⟶ A2+ + e– : E2
The energy required to pull out the two electrons are E1 and E2 respectively. The correct relationship between two energies would be
Solution
IE1 is always less than IE2
Quite a large jump between the values of second and third ionization potentials of an atom would correspond to the electronic configuration
Solution
3rd ionization involves removal of electron from inert gas configuration 1s2 2s2 2p6, hence there would be a large jump between 2nd and 3rd ionization energies.
In which of the following arrangements, the order is NOT according to the property indicated against it?
Solution
In a period the value of ionisation potential increases from left to right with breaks where the atoms have some what stable configuration. In this case N has half filled stable orbitals. Hence has highest ionisation energy. Thus the correct order is B < C < O < N and not as given in option (c).
The formation of the oxide ion O2-(g) requires first an exothermic and then an endothermic step as shown below
O(g)+ e– = O–(g) ∆H ° = -142 kJmol-1
O–(g)+ e– = O2-(g) ∆H ° = 844 kJmol-1
This is because
Solution
O–ion exerts a force of repulsion on the incoming electron. The energy is required to overcome it.
Among Al2O3, SiO2, P2O3 and SO2 the correct order of acid strength is
