Electron Affinity

Q.

Can ionic bonds be broken?

Q.

How do you determine if a bond is ionic or covalent?

Q. The correct order of electron affinity among the following is:

1. $Se>O$
2. $P>N$
3. $Cl>F$
4. All of the above

Q. Statement I F -atom has a less negative electron affinity than Cl-atom.
Statement II Additional electrons are repelled more effectively by 3p-electrons in Cl-atom than by 2p-electrons in F-atom.

1. Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
2. Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.
3. Statement I is true; Statement II is false.
4. Statement I is false; Statement II is true.

Q.

Define electron affinity. What is its unit?

Q. The correct order of electron affinity among the following species:
$O,S,Se$

1. $O>S>Se$
2. $S>Se>O$
3. $Se>S>O$
4. $O>Se>S$

Q. The electronic configurations of four elements are given below. Arrange these elements in the correct order of magnitudes (without sign) of their electron affinities:
$i.2s^{2}2p^5$ $ii.3s^{2}3p^5$
$iii.2s^{2}2p^4$ $iv.3s^{2}3p^4$
Select the correct answer using the codes given below:

1. $\left(i\right)<\left(ii\right)<\left(iii\right)<\left(iv\right)$
2. $\left(ii\right)>\left(i\right)>\left(iv\right)>\left(iii\right)$
3. $\left(i\right)<\left(iii\right)<\left(iv\right)<\left(ii\right)$
4. $\left(iii\right)>\left(iv\right)>\left(ii\right)>\left(i\right)$

Q. When an electron is added to the neutral isolated atom, energy is given out. It is an exothermic process. In this process, monoanion is formed. Electron affinity of an element is defined as the amount of energy liberated when an electron is added to the neutral isolated atom in its ground state. Greater the amount of energy released, greater is the electron affinity. Electron affinity is expressed in terms of $eVato{m}^{-1}$ or $Kcal$ or $kJmo{l}^{-1}$.

Electron affinity of elements depends on which of the following?

1. Atomic size

2. Nuclear charge

3. Configuration

4. Chemical environment

Q. Which of the following orders is incorrect about electron affinity?

1. $P>N$
2. $B>N$
3. $O>Se$
4. $Cl>I$

Q. $A_0/2$ atoms of $X\left(g\right)$ are converted into $X^{+}\left(g\right)$ by absorbing energy $E_1$. $A_0/2$ of $X^{+}\left(g\right)$ are converted into $X^{-}\left(g\right)$ with the release of energy, $E_2$. Hence the ionisation energy and the electron affinity of $X\left(g\right)$ are repectively _____ and _______.

1. $\frac{2E_1}{A_0},\frac{2(E_1-E_2)}{A_0}$
2. $\frac{2E_1}{A_0},\frac{2(E_2-E_1)}{A_0}$
3. $\frac{(E_1-E_2)}{A_0},\frac{2E_2}{A_0}$
4. None of these

Q. The electron affinity of chlorine is $+37eV$. How much energy in $kJ$ is released when $3.55g$ of chlorine is converted completely into $Cl$ ion in the gaseous state . $(1eV=96.49kJ/mole)$

Q.

The correct order of electron affinity is

1. Be < B < C < N

2. N < Be < C < B

3. N < Be > C < B

4. N < C < B < Be

Q. The electron affinity values $\left(inkJmo{l}^{-1}\right)$ of three halogens x, y and z are respectively -349, -333 and -325. Then x, y and z are respectively

1. $F_2,C{l}_{2}andB{r}_2$
2. $C{l}_2,F_{2}andB{r}_2$
3. $C{l}_2,B{r}_{2}and{F}_2$
4. $B{r}_2,C{l}_{2}and{F}_2$

Q. The ionisation energy and electron affinity of an element are $13eV$ and $3.8eV$ respectively. Find the electronegativity of this element on Pauling's scale.

Q.

$\text{Electron gain enthalpy}\alpha \frac{1}{\text{Atomic size}}$

1. True

2. False

Q. The element that has postive electron gain enthalpy among the following is

1. N
2. O
3. F
4. none of the above

Q.

On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.
For the process
$A_{\left(g\right)}+e^{-}\to A_{\left(g\right)}^{-};\Delta H=xand{A}_{\left(g\right)}^{-}\to A_{\left(g\right)}+e^{-};\Delta H=y$
Select correct alternate:

1. Ionization energy of $A_{\left(g\right)}^{-}$ is y

2. Electron affinity of $A_{\left(g\right)}$ is x

3. Electron affinity of $A_{\left(g\right)}$ is -y

4. All are correct statements

Q.

Which one of the elements has the maximum electron affinity?

1. F

2. Cl

3. Br

4. I

Q. Which of the following has the greatest electron affinity?

1. O
2. S
3. Se
4. Te

Q.

The electron affinities of N, O, S, and Cl are such that

1. N < O < S < Cl

2. O < N < Cl < S

3. O ≈ Cl < N ≈ S

4. O < S < Cl < N

Q.

On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.
For the process
$A_{\left(g\right)}+e^{-}\to A_{\left(g\right)}^{-};\Delta H=xand{A}_{\left(g\right)}^{-}\to A_{\left(g\right)}+e^{-};\Delta H=y$
Select correct alternate:

1. Ionization energy of $A_{\left(g\right)}^{-}$ is y

2. Electron affinity of $A_{\left(g\right)}$ is x

3. Electron affinity of $A_{\left(g\right)}$ is -y

4. All are correct statements