Penetration Effect

Q.

Identify the least stable ion amongst the following.

1. $L{i}^{+}$

2. $B{e}^{-}$

3. $B^{-}$

4. $C^{-}$

Q. Arrange the following ions in order of decreasing ionic radii: $L{i}^{2+},H{e}^{+},B{e}^{3+}.$

1. $L{i}^{2+}>H{e}^{+}>B{e}^{3+}$
2. $L{i}^{2+}<H{e}^{+}<B{e}^{3+}$
3. $H{e}^{+}>L{i}^{2+}>B{e}^{3+}$
4. All are same

Q.

Which of the following ion has smallest ionic radius?

1. 

2. 

3. 

4. 

Q. When the following five anions are arranged in order of decreasing ionic radius, the correct sequence will be:

1. $S{e}^{2-},I^{-},B{r}^{-},O^{2-},F^{-}$
2. $I^{-},S{e}^{2-},O^{2-},B{r}^{-},F^{-}$
3. $S{e}^{2-},I^{-},B{r}^{-},F^{-},O^{2-}$
4. $I^{-},S{e}^{2-},B{r}^{-},O^{2-},F^{-}$

Q. In a given energy level, the order of penetration effect of different orbitals is:

1. $f<d<p<s$
2. $s<p<d<f$
3. $s=p=d=f$
4. $f<p<d<s$

Q.

Which of the following ion has smallest ionic radius?

1. $K^{+}$

2. $C{a}^{2+}$

3. $T{i}^{3+}$

4. $T{i}^{4+}$

Q. The number of unpaired electrons in a chromic ion $C{r}^{+3}$ (atomic number 24) is:

1. 4
2. 1
3. 3
4. 6

Q. From the following ions, which has the highest value of ionic radius?

1. $O^{2-}$
2. $B^{3+}$
3. $L{i}^{+}$
4. $F^{-}$

Q. Which is not correct statement ?

1. Ions of d-block elements are coloured due to d-d transition.
2. Ions of f-block elements are coloured due to f-f tsransition.
3. $\left[Sc\right(H_{2}O{)}_6{]}^{3+},\left[Ti\right(H_{2}O{)}_6{]}^{4+}$ are coloured complexes.
4. $C{u}^{+}$ is colourless ion.

Q. Azide ion $\left(N_3{}^{-}\right)$ exhibits on $N-N$ bond order of 2 and may be represented by resonance structures I, II and III given below.
$:\stackrel{-}{\underset{..}{N}}=\stackrel{+}{N}=\stackrel{-}{\underset{..}{N}}:⟷{}^{2-}:\ddot{\underset{..}{N}}-\stackrel{+}{N}\equiv N:⟷:N\equiv \stackrel{+}{N}-\ddot{\underset{..}{N}}{:}^{2-}$
I II III
Select correct statements.

1. Structures I and II make greater contributions than II
2. All the three structures make equal contributions
3. Structures I and II make greater contributions than III
4. Structures II and III make smaller contributions than I

Q. In a given energy level, the order of penetration effect of different orbitals is

1. $f<d<p<s$
2. $s=p=d=f$
3. $s<p<d<f$
4. $p>s>d>f$

Q. Assertion :The mobility of sodium ion is lower than that of potassium ion. Reason: The ionic mobilities depend on the effective radius of the ion.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Identify the least stable ion amongst the following :

1. $L{i}^{-}$
2. $B{e}^{-}$
3. $C^{-}$
4. $B^{-}$

Q.

The electron structures of four elements are given below.

(i) $\text{A→2, 8, 1}$ (ii) $\text{B→2, 8, 8}$

(iii) $\text{C→2, 8, 7}$ (iv) $\text{D→2, 8, 18, 18, 1}$

Arrange the above elements in the order of elements with:

(A) Zero electron affinity

(B) Minimum ionization energy

(C) Good oxidizing agent

(D) Best reducing agent in the third period

1. DBAC

2. BDAC

3. DBCA

4. BDCA

Q. The correct order of ionic radii is :

1. $T{e}^{2-}$ > $I^{-}$ > $C{l}^{-}$ > $A{r}^{+}$
2. $I^{-}$ > $T{e}^{2-}$ > $C{l}^{-}$ > $A{r}^{+}$
3. $I^{-}$ > $T{e}^{2-}$ > $A{r}^{+}$ > $C{l}^{-}$
4. $I^{-}$ > $C{l}^{-}$ >$T{e}^{2-}$ > $A{r}^{+}$

Q. The least stable ion in the following is:

1. $L{i}^{-}$
2. $B{e}^{-}$
3. $B^{-}$
4. $C^{-}$

Q. When the following five anions are arranged in order of decreasing ionic radius, the correct sequence will be:

1. $S{e}^{2-},I^{-},B{r}^{-},O^{2-},F^{-}$
2. $I^{-},S{e}^{2-},O^{2-},B{r}^{-},F^{-}$
3. $S{e}^{2-},I^{-},B{r}^{-},F^{-},O^{2-}$
4. $I^{-},S{e}^{2-},B{r}^{-},O^{2-},F^{-}$

Q. Explain the formation of $H_3{O}^{+}$ ion and comment about its shape and bond angle with proper justification.

Q.

Q. In a given energy level, the order of penetration effect of different orbitals is:

1. $f<p<d<s$
2. $s<p<d<f$
3. $f<d<p<s$
4. $s=p=d=f$

Q. $T{i}^{2+}$