Cationic Radius

Q.

Which of the following has the smallest size

1. Na⁺

2. Mg⁺²

3. F^-

4. Cl^-

Q.

Which of the following statement is correct regarding covalent radius and van der Waals radius?

1. van der Waals radius is always smaller than covalent radii

2. van der Waals radius is twice covalent radii

3. van der Waals radius is equal to covalent radii

4. van der Waals radius is always larger than covalent radii

Q. If r1 is the radius of the first orbit of hydrogen atom, then the radii of second, third and fourth orbits in term of r are

Q. 47. If r is the radius of the first orbit, the radius of nth orbit of H atom is given by

Q. 25. How to calculate effective nuclear charge (Z effective) of N+ ?

Q. Ratio of energy of first orbit of hydrogen atom andsecond orbit of He^{} ion is

Q. Which ion has higher electronegativity? Fe^{+2} or Fe^{+3}?

Q. If the radius of an octahedral void is r, and the radius of atom in close packing is R, then the relation between r& R is (1)R=0.414r (2)r=0.732R (3)r=0.414R (4)r=0.532

Q.

Which of the following has covalent radius more than germanium?

1. C

2. Si

3. Sn

4. B

Q.

The ionic radii (in Å) of N³¯, O²¯ and F¯ are respectively:

1. 1.36, 1.40 and 1.71

2. 1.36, 1.71 and 1.40

3. 1.71, 1.40 and 1.36

4. 1.71, 1.36 and 1.40

Q.

What is the difference between covalent radius and van der Waals radius?

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.

Of the following, the one with the largest size is?

1. $C{l}^{-}$

2. Ar

3. $K^{+}$

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

Q.

In acid solution, the reaction

MnO₄^- → Mn²⁺ shows:

1. Oxidation by 5 electrons

2. Oxidation by 3 electrons

3. Oxidation by 7 electrons

4. Reduction by 5 electrons

Q.

Explain why cations are smaller and anions larger in radii than their parent atoms?

Q. Molecule having maximum covalent character among the following is

1. $Mg{F}_2$
2. $AlC{l}_3$
3. $MgC{l}_2$
4. $Al{F}_3$

Q. Which of the following order of radii is correct?

1. $Li<Be<Mg$
2. $N{a}^{+}>F^{-}>O^{-2}$
3. $O<F<Ne$
4. $H^{+}<L{i}^{+}<H^{-}$

Q. Ionic radii of which ions is same

1. 

2. 

3. 

4. 

Q. The set(s) representing the correct order of ionic radius is/are:

1. $L{i}^{+}>B{e}^{2+}>N{a}^{+}>M{g}^{2+}$
2. $N{a}^{+}>L{i}^{+}>M{g}^{2+}>B{e}^{2+}$
3. $L{i}^{+}>N{a}^{+}>M{g}^{2+}>B{e}^{2+}$
4. $M{g}^{2+}>B{e}^{2+}>L{i}^{+}>N{a}^{+}$

Q. The fractional charge on each atom in HBr molecule is [Given that dipole moment of HBr= 0.78 D, Bond length of HBr = 1.41 A]

Q. Calculate ratio of the radius of 2nd orbit of H atom and 3rd?

Q.

In which of the following compounds does manganese have the maximum radius?

1. $Mn{O}_2$

2. $KMn{O}_4$

3. $MnO$

4. $K_3\left[Mn\right(CN{)}_6]$

Q. Calculate the ratio of the radius of 1 st bohr orbit of H atom to that of 4th bohr orbit

Q. calculate the radius of the second orbit of li+ ion

Q. 6. The ratio of the radii of the orbit in H atom having difference between their K.E is equal to 12.75 ev is

Q. xample, anZn, 4s and 3d e experience different effective nuclear charge4s, σ 10 x 1.0 + 18 x 0.85 + 1 x 0.35 25.65For eZ 30-25.65 4.353d, σ-181.0 + 9 x 0.35-21.15Z 30-21.15 8.85

Q.

If the ionic radii of $K^{+}$ and $F^{-}$ are nearly the same (i.e $1.34\mathring{A}$) then the atomic radii of $K$ and $F$ are respectively are

1. $1.34\mathring{A},1.34\mathring{A}$

2. $0.72\mathring{A},1.96\mathring{A}$

3. $1.96\mathring{A},0.72\mathring{A}$

4. $1.96\mathring{A},1.34\mathring{A}$