Electron Affinity

Q. The electron gain enthalpy of chlorine is $–349kJmo{l}^{-1}$. How much energy in $kJ$ is released when $3.55g$ of chlorine is converted completely into $C{l}^{-1}$ ion in the gaseous state?

1. 34.9

Q. If energy required to remove one of the the electrons from He atom is 29.5 eV, then what is the value of energy required to convert a heliumatom into α -particle?(1) 54.4 eV(3) 29.5 ev(2) 83.9 ev(4) 24.9 ev

Q.

Half-filled or completely filled sub-shells have lesser ionization energy comparitively. (True/False)

1. True

2. False

Q.

Which of the following statement is correct regarding alkali metals

1. Cation is greater in size than the atom

2. Cation is less stable than the atom

3. Size of cation and atom is the same

4. Cation is smaller than the atom

Q. Addition of an electron to a neutral gaseous atom always leads to
(i) Formation of an anion
(ii) Liberation of energy
(iii) Decrease in proton/electron ratio
Are all these option correct?

Q. What does the negative electronic energy (En) for hydrogen atom mean?

Q.

Which one of the elements has the maximum electron affinity ?

1. F

2. Cl

3. Br

4. I

Q. 11.Why with higher energy atoms or molecules are in unstable state and want to go back to lower energy state

Q. Which arrangement represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

1. $F<Cl<O<S$
2. $O<S<F<Cl$
3. $Cl<F<S<O$
4. $S<O<Cl<F$

Q. In hydrogen atom energy of first excited state is -3.4 eV. Then find out KE of same orbit of hydrogen atom.

Q.

Ion with highest polarizing power is ______.

1. ${Mg}^{2+}$

2. ${Ca}^{2+}$

3. ${Al}^{3+}$

4. ${Na}^{+}$

Q.

wt is the basic difference between electron gain enthalpy and electronegativity

Q. The standard free energy change for the given reaction is - $10.26kcalmo{l}^{-1}$ at ${25}^{\circ }C.$
$H_2\left(g\right)+2AgCl\left(s\right)\to 2Ag\left(s\right)+2H^{+}\left(aq\right)+2C{l}^{-}\left(aq\right)$
A cell using the above reaction is operated at ${25}^{\circ }C$ under conditions,
$P_{H_2}=1atm$
$\left[H^{+}\right]\text{and}\left[C{l}^{-}\right]=0.1M$

Calculate the emf of the cell.

1. $0.340V$
2. $0.240V$
3. $0.140V$
4. $0.440V$

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. Select the correct option for the below statements:
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.

why can the electron gain enthalpy be endothermic or exothermic?
and why not endothermic alone
how can it be exothermic?

Q. Electron affinity of the element or ions is correctly shown in :

1. $S>O^{-}$
2. $O>S^{-}$
3. $S>O$
4. $N^{-}>S$

Q. In group IA of alkali metals, the ionisation potential decreases down the group. Therefore, lithium is a poorer reducing agent in gaseous medium.

1. True
2. False

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. ${\text{Zn|Zn}}^{2+}\left(C_1\right)||{\text{Zn}}^{2+}\left(C_2\right)|\text{Zn}.$ For this cell, Gibb's free energy change, $\Delta G$ is negative if:

1. $C_1>C_2$
2. $\text{None of these}$
3. $C_1<C_2$
4. $C_1=C_2$

Q.

what is meant by negative value of electron gain enthalpy and positive value of electron gain enthalpy

Q. Which one of the following statements is incorrect in relation to ionization enthalpy?
(a) Ionization enthalpy increases for each successive electron.
(b) The greatest increases in ionization enthalpy is experienced on removal of electron from core noble gas configuration.
(c) End of valence electrons is marked by a big jump in ionization enthalpy.
(d) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

Q. What is meant by “Energy of an electron in a hydrogen atom is quantized”