Ionization Energies

Q.

What is the order of forbidden gap in the energy bands of silicon?

Q. Elements of which period, among the following, will not have f-subshell in its electronic configuration?

1. $5^{th}$ period elements
2. $4^{th}$ period elements
3. $7^{th}$ period elements
4. $3^{rd}$ period elements

Q.

Which of the following shells represent the orbit number (n) = 2?

1. N shell

2. M shell

3. L shell

4. K shell

Q.

During the distribution of electrons, the shells are filled in step wise manner . Select the option which indicates the way order in which the shells are filled.

1. Outermost shells to innermost shells

2. Middle shells first and then inner and outer shells alternatively
3. Shells are filled in random

4. Innermost shells to outermost shells

Q. The formation of negative ion is:

1. Ectothermic
2. Exothermic
3. None of the above
4. Endothermic

Q. The first ionization enthalpies of 5d elements is higher than that of the corresponding 3d and 4d elements. This is best explained by:

1. Greater effective nuclear charge in the case of 5d elements due to the poor shielding of valence electrons by the 4f electrons
2. Greater extent of metallic bonding in 5d elements
3. Neither a nor b
4. Both a and b

Q.

Question 6 (d)
The position of three elements A, B and C in the periodic table are shown below –
$\begin{array}{cc}\text{Group 16}& \text{Group 17}\\ -& -\\ -& \text{A}\\ -& -\\ \text{B}& \text{C}\end{array}$

Which type of ion, cation or anion, will be formed by element A?

Q.

1. What is meany by shell and sub shell ?

Q. The molecule in which an atom is associated with more than $8e^{-}$ is known as hyper valent molecule. All hyper valent molecules must have $d\pi -p\pi$ bonding but the molecule having back bonding need not have always $d\pi -p\pi$ bonding.
Which of the following molecule is having complete octet?

1. $BeC{l}_2$ (dimer)
2. $Be{H}_2$ (dimer)
3. $Be{H}_2$ (s)
4. $BeC{l}_2\left(s\right)$

Q. I am interested to remove an electron from Ce to convert it to $C{e}^{+}$ and further all the way to $C{e}^{3+}$. Which process requires higher ionization energy?

1. Both A and B require the same amount of energy.
2. cannot be answered
3. $C{e}^{+1}$ to $C{e}^{+3}$
4. Ce to $C{e}^{+1}$

Q. To which radioactive families do the following nuclides belong?
${}^{222}Rn{,}^{228}Ra{,}^{207}Pb{,}^{209}Bi{,}^{233}Pa$

Q. An element has electronic configuration $1s^{2}2s^{2}2p^{6}3s^1$ in its +2 oxidation state. The formula of its sulphide is :

1. $M_3{S}_2$
2. $M{S}_2$
3. $M{S}_3$
4. $M_2{S}_3$

Q. The atomic number of the elements $X$ and $Y$ are $20,26$ respectively. When these elements combine with chlorine, three compounds $XC{l}_2,YC{l}_2,YC{l}_3$ are formed.
Explain the reason for this, on the basis of the subshell based electronic configuration.

Q. The atomic number of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26 which one of these may be expected to have the highest second ionization enthalpy

1. V
2. Cr
3. Mn
4. Fe

Q.

The values of ‘n’ for N, M, L and K respectively are:

1. 4, 3 , 1 and 2

2. 4, 1 , 2 and 4

3. 4, 3 , 2 and 1

4. 1, 2 , 3 and 4

Q. ${}_{89}A{c}^{227}$ is a member of actinium series. Another member of the same series is :

1. ${}_{92}{U}^{235}$
2. ${}_{89}A{c}^{225}$
3. ${}_{90}T{h}^{232}$
4. ${}_{15}{P}^{34}$
5. ${}_{15}{P}^{217}$

Q. The atomic numbers of V, Cr, Mn and Fe are 23, 24, 25 and 26 respectively. Which one of these may be expected to have the highest second ionization enthalpy?

1. Fe
2. V
3. Cr
4. Mn

Q.

The order of first ionization potential values of three elements ‘X’ , ‘Y’ and ‘Z’ is $\text{Y>Z>X}$. What could be the elements X, Y and Z?

1. $\mathrm{Al},\mathrm{Si},\mathrm{P}$

2. $\mathrm{C},\mathrm{N},\mathrm{O}$

3. $\mathrm{N},\mathrm{O},\mathrm{F}$

4. $\mathrm{S},\mathrm{Cl},\mathrm{Ar}$

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.

1. a
2. b
3. c
4. d

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.

1. a
2. b
3. c
4. d

Q. ${}_{84}^{210}Po⟶$ ${}_{82}^{206}Pb{+}_2^{4}He$

1. $VB$
2. $IIA$
3. $VIA$
4. $IVB$