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
-
Solution
