Electron Gain Enthalpy
(i) Action of warm water on AlN.
(ii) Action of hot and concentrated Nitric acid on copper.
(iii) Action of Hydrochloric acid on sodium bicarbonate.
(iv) Action of dilute Sulphuric acid on Sodium Sulphite.
(v) Preparation of ethanol from Ethyl Chloride.
Electron gain enthalpy depends on:
Effective Nuclear charge
Screening or shielding effect
Stability of half filled and completely filled orbitals.
Which one of the following is incorrect?
An element which has high electro negativity always has high electron gain enthalpy
Electron gain enthalpy is the property of an isolated atom
Electro negativity is the property of a bonded atom
Both electro negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size
The ionization energy of F− is 320 kJ/mole. The electron gain enthalpy of fluorine would be?
- Electron gain enthalpy is the property of a bonded atom
- Electro-negativity is the property of a bonded atom
- An element which has high electro-negativity always has high electron gain enthalpy
- Both electro-negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size.
If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction.
The numerical value of energy involved in the given process K→K− is less than that of which of the following processes?
None of these
Both (a) and (b)
Which of the following represents correct order of increasing electron gain enthalpy with negative sign for the elements 0, S, F and Cl? [CBSE AIPMT 2010]
CI< F< O< S
O< S< F< CI
F< S< O< CI
S< O< CI< F
For the processes K+(g) I⟶ K(g) II⟶K−(g)
Energy is released in (I) and absorbed in (II)
Energy is absorbed in both the processes
Energy is absorbed in (I) and released in (II)
Energy is released in both the processes
Electron gain enthalpy of F− is
-320 KJ mol
-160 KJ mol
160 KJ mol
+320 KJ mol
Second electron gain enthalpy
is always negative (energy is released)
can be positive or negative
is always positive (energy is released)
is always zero