Electron Gain Enthalpy

Q. Write balanced chemical equations for each of the following:
(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.

Q.

Electron gain enthalpy depends on:

1. Atomic size

2. Effective Nuclear charge

3. Screening or shielding effect

4. Stability of half filled and completely filled orbitals.

Q.

Which one of the following is incorrect?

1. An element which has high electro negativity always has high electron gain enthalpy

2. Electron gain enthalpy is the property of an isolated atom

3. Electro negativity is the property of a bonded atom

4. Both electro negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size

Q.

The ionization energy of $F^{-}$ is 320 kJ/mole. The electron gain enthalpy of fluorine would be?

1. -320 KJ/mole

2. -160 KJ/mole

3. 320 KJ/mole

4. 160 KJ/mole

Q. Which one of the following is incorrect?

1. Electron gain enthalpy is the property of a bonded atom
2. Electro-negativity is the property of a bonded atom
3. An element which has high electro-negativity always has high electron gain enthalpy
4. Both electro-negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size.

Q.

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 $K\to K^{-}$ is less than that of which of the following processes?

1. $K^{-}\to K$

2. $K\to K^{+}$

3. None of these

4. Both (a) and (b)

Q.

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]

1. CI< F< O< S

2. O< S< F< CI

3. F< S< O< CI

4. S< O< CI< F

Q.

For the processes $K^{+}\left(g\right)\stackrel{I}{⟶}K\left(g\right)\stackrel{II}{⟶}{K}^{-}\left(g\right)$

1. Energy is released in (I) and absorbed in (II)

2. Energy is absorbed in both the processes

3. Energy is absorbed in (I) and released in (II)

4. Energy is released in both the processes

Q.

Electron gain enthalpy of $F^{-}$ is

1. -320 KJ mol

2. -160 KJ mol

3. 160 KJ mol

4. +320 KJ mol

Q.

Second electron gain enthalpy

1. is always negative (energy is released)

2. can be positive or negative

3. is always positive (energy is released)

4. is always zero