Cationic Radius

Q.

Explain the electronic concept of oxidation and reduction.

Q.

Which of the following has the largest size?

1. Al⁺

2. Al⁺³

3. Al

4. Al⁺²

Q. Removal of hydrogen from a substance is known as oxidation.

1. True
2. False

Q. 13. Increase in atomic size down the group is due to(1) In crease in number of orbit(2) Increase in number of protons and neutrons(3) Increase in number of protons(4) Increase in number of protons, neutrons andelectrons

Q. Arrange the following species in the increasing order of their ionic radii, giving reasons.
${Mg}^{2+},O^{2-}{Al}^{3+};N^{3-},F^{-},{Na}^{+}$

Q.

$N{a}^{+}.M{g}^{2+},A{l}^{3+}$ and $S{i}^{4+}$ are isoelectronic. The order of their ionic size is

1. $N{a}^{+}>M{g}^{2+}<A{l}^{3+}<S{i}^{4+}$

2. $N{a}^{+}<M{g}^{2+}>A{l}^{3+}>S{i}^{4+}$

3. $N{a}^{+}>M{g}^{2+}>A{l}^{3+}>S{i}^{4+}$

4. $N{a}^{+}<M{g}^{2+}>A{l}^{3+}<S{i}^{4+}$

Q. Give four examples of species which are isoelectronic with $C{a}^{2+}.$

Q. Consider the following species :

Q.

Write the name of the ion of Chlorine. Also, write their representation.

Q. the radius of which ion is closest to that Li^{+ }ion? a) Na^+ b)Be^{+2} c)Mg^{+2} d)Al^{+3} explain why?

Q.

Write the name of the ion of Fluorine. Also, write their representation.

Q.

Ionic radii of

1. 

2. 

3. 

4. 

Q. The correct order of ionic radii among the following is:

1. $T{i}^{4+}<M{n}^{7+}$
2. ${}^{35}C{l}^{-}{<}^{37}C{l}^{-}$
3. $K^{+}>C{l}^{-}$
4. $p^{3+}>p^{5+}$

Q. Which elements belong to d-block

1. Na
2. Cu
3. Ca
4. Ar

Q.

The species $Ar,K^{+}andC{a}^{2+}$ contain the same number of electrons. In which order do their radii increase?

1. $C{a}^{2+}<K^{+}<Ar$

2. $K^{+}<Ar<C{a}^{2+}$

3. $C{a}^{2+}<Ar<K^{+}$

4. $Ar<K^{+}<C{a}^{2+}$

Q. ntIf the difference between nth and n+1th Bohr radii of H atom is =to its n-1th Bohr radius.the value of n??n

Q. Which of the following has largest ionic radii?

1. $F^{-}$
2. $H^{-}$
3. ${Be}^{-}$
4. ${CI}^{-}$

Q. If $r_1$ is the radius of the first orbit of hydrogen atom, then the radii of second, third and fourth orbits in term of $r_1$ are :

1. $r_1^2,r_1^3,r_1^4$
2. $4r_1,9r_1,16r_1$
3. $8r_1,27r_1,64r_1$
4. $2r_1,6r_1,8r_1$

Q.

Which of the following has the smallest size?

1. Cl^-

2. F^-

3. Na⁺

4. Mg⁺²

Q. The ionic radii of $N^{3-}$ and $F^{-}$ are $1.76\stackrel{o}{A}$ and $1.36\stackrel{o}{A}$ respectively. The ionic radius of $O^{2-}$ will be:

1. $1.40\stackrel{o}{A}$
2. $2.06\stackrel{o}{A}$
3. $1.96\stackrel{o}{A}$
4. $1.20\stackrel{o}{A}$

Q. Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species $O^{2-},S^{2-},N^{3-},P^{3-}$?

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

Q.

Which one of the following is the smallest cation?

1. $N{a}^{+}$

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

3. $A{l}^{3+}$

4. $M{g}^{2+}$

Q. How are bonds made between ions?

Q.

The ionic species having largest size is?

1. $L{i}_{\left(aq\right)}$

2. $N{a}_{\left(aq\right)}$

3. $R{b}_{\left(aq\right)}$

4. $C{s}_{\left(aq\right)}$

Q. Consider the following species.
$N^{3-},O^{2-},M{g}^{2+}$ and $F^{-}$
(i) What is common in them?
(ii) arrange them in order of increasing ionic radii.

Q.

1. True
2. False

Q. The correct order of ionic size of $N^{3-}$, $N{a}^{+}$, $F^{-}$, $M{g}^{2+}$ and $O^{2-}$ is:

1. $M{g}^{2+}<N{a}^{+}<F^{-}<O^{2-}<N^{3-}$
2. $N^{3-}<F^{-}>O^{2-}>N{a}^{+}>M{g}^{2+}$
3. $M{g}^{2+}>N{a}^{+}>F^{-}>O^{2-}<N^{3-}$
4. $N^{3-}>O^{2-}>F^{-}>N{a}^{+}<M{g}^{2+}$

Q. The correct order of increasing radii of the ions $B{r}^{-},F^{-},O^{2-}$ and $S^{2-}$ is as follows:

1. $B{r}^{-}<F^{-}<O^{2-}<S^{2-}$
2. $F^{-}<B{r}^{-}<O^{2-}<S^{-}$
3. $S^{2-}<O^{2-}<F^{2-}<B{r}^{-}$
4. $F^{-}<O^{2-}<S^{2-}<B{r}^{-}$

Q. The ionic radii of ${Li}^{+}$ ${Be}^{2+}$ and $B^{3+}$ follow the order:

1. ${Be}^{2+}>B^{3+}>{Li}^{\ast }$
2. ${Li}^{+}>B^{3+}>{Be}^{2+}$
3. $L{i}^{+}>B{e}^{2+}>B^{3+}$
4. $B^{3+}>B{e}^{2+}>L{i}^{+}$

Q. An ionic crystal lattice has $\frac{r^{+}}{r^{-}}$ radius ratio of $0.320$, its co-ordination number is:

1. $3$
2. $8$
3. $6$
4. $4$