Magnetic Moment Examples

Q.

The calculated spin-only magnetic moment of ${\mathrm{Cr}}^{2+}$ ion is ?

1. $2.84\mathrm{BM}$

2. $3.87\mathrm{BM}$

3. $4.90\mathrm{BM}$

4. $5.92\mathrm{BM}$

Q.

Define the compressibility factor of an ideal gas.

Q.

The number of bridging CO ligands in $\left[{\mathrm{Mn}}_2{\left(\mathrm{CO}\right)}_{10}\right]$is _____.

Q.

What is the spin only magnetic moment of ${\text{Mn}}^{2+}$(aq) ion?

Q.

Expalin why $\left[Fe\right(H_{2}O{)}_6{]}^{3+}$ has magnetic moment value of 5.92 BM whereas $\left[Fe\right(CN{)}_6{]}^{3-}$ has a value of only 1.74 BM?

Q.

Magnetic moment of $[MnC{l}_4{]}^{2-}$ is 5.92 BM. Explain giving reason present.

Q. The calculated spin only magnetic moment of $C{o}^{2+}$ ion is

1. $4.90\text{BM}$
2. $5.92\text{BM}$
3. $2.84\text{BM}$
4. $3.87\text{BM}$

Q. Magnetic moment 2.84 B.M. is given by (At. nos. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. $C{r}^{2+}$
2. $T{i}^{3+}$
3. $C{o}^{2+}$
4. $N{i}^{2+}$

Q. The correct order of the spin only magnetic moment of metal ions in the following low spin complexes, $\left[V\right(CN{)}_6{]}^{4-}$ , $\left[Fe\right(CN{)}_6{]}^{4-}$, $\left[Ru\right(N{H}_3{)}_6{]}^{3+}$ and $\left[Cr\right(N{H}_3{)}_6{]}^{2+}$ is:

1. $V^{2+}>C{r}^{2+}>R{u}^{3+}>F{e}^{2+}$
2. $C{r}^{2+}>R{u}^{3+}>F{e}^{2+}>V^{2+}$
3. $C{r}^{2+}>V^{2+}>R{u}^{3+}>F{e}^{2+}$
4. $V^{2+}>R{u}^{3+}>C{r}^{2+}>F{e}^{2+}$

Q. If helium and methane are allowed to diffuse out of the container under similar conditions of temperature and pressure, then the ratio of rate of diffusion of helium to methane is:

1. $1:2$
2. $2:1$
3. $1:4$
4. $4:1$

Q.

Basicity increases down the group. Explain

Q.

Amongst the following ions which one has the highest magnetic moment value?

(i) $\left[Cr\right(H_{2}O{)}_6{]}^{3+}$ (ii) $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$ (iii) $\left[Zn\right(H_{2}O{)}_6{]}^{2+}$

Q. The highest value of spin only magnetic moment (calculated) (in $BM$) among all the transition metal complexes is:

1. 3.87
2. 5.92
3. 6.93
4. 4.9

Q.

$\left[Cr\right(N{H}_3{)}_6{]}^{3+}$ is paramagnetic while $\left[Ni\right(CN{)}_4{]}^{2-}$ is diamagnetic. Explain, Why?

Q.

Is water paramagnetic?

Q.

Atomic number of Mn. Fe and Co are 25, 26 and 27 respectively. Which of the following inner orbital octahedral complex ions are diamangetic?
(a) $\left[Co\right(N{H}_3{)}_6{]}^{3+}$
(b) $\left[Mn\right(CN{)}_6{]}^{3-}$
(c) $\left[Fe\right(CN{)}_6{]}^{4-}$
(d) $\left[Fe\right(CN{)}_6{]}^{3-}$

Q.

Spin only magnetic moment of the compound $Hg\left[Co\right(SCN{)}_4]$ is

1. $\sqrt{8}$

2. $\sqrt{3}$

3. $\sqrt{24}$

4. $\sqrt{15}$

Q.

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In $Tl{I}_3$, isomorphous to $Cs{I}_3$, the metal is present in $+1$ oxidation
state.

Reason R: $Tl$ metals has fourteen $f$ electrons in its electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both A and R are correct and R is the correct explanation of A
2. A is not correct but R is correct
3. Both A and R are correct and R is not the correct explanation of A
4. A is correct but R is not correct

Q. A compound of vanadium has a magnetic moment $\left(\mu \right)$ of $1.73BM$. If the vanadium ion in the compound is present as $V^{x+}$, then the value of $x$ is ?

Q. Arrange the following cobalt complexes in the order of increasing crystal field stabilisation energy (CFSE) value.

Complexes :
A . ${\left[Co{F}_6\right]}^{3-}$
B . ${\left[Co{\left(H_{2}O\right)}_6\right]}^{2+}$
C . ${\left[Co{\left(N{H}_3\right)}_6\right]}^{3+}$
D . ${\left[Co{\left(en\right)}_3\right]}^{3+}$

Choose the correct option :

1. C < D < B < A
2. B < C < D < A
3. A < B < C < D
4. B < A < C < D

Q. Hybridisation of Al atom changes in :
$Al{H}_3$ changes to $Al{H}_4^{-}$

1. $s{p}^2$ to $s{p}^3$
2. $s{p}^3$ to $s{p}^2$
3. $s{p}^{3}d$ to $s{p}^3$
4. both have same hybridisation

Q.

Match List-I with List-II

List-I	List-II
(a) Haematite	(i) Al2O3. xH2O
(b) Bauxite	(ii) Fe2O3
(c) Magnetite	(iii) CuCO3. Cu(OH)2
(d) Malachite	(iv) Fe3O4

Choose the correct answer from the options given below:

1. (a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)

2. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

4. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Q.

The shape of ${\mathrm{NH}}_3$ molecule is:

1. tetrahedral

2. trigonal planar

3. trigonal pyramidal

4. linear

Q.

Which of the following compounds is not colored yellow?

1. ${\mathrm{Zn}}_2\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$

2. ${\mathrm{BaCrO}}_4$

3. ${\mathrm{K}}_3\left[\mathrm{Co}{\left({\mathrm{NO}}_2\right)}_6\right]$

4. ${\left({\mathrm{NH}}_4\right)}_3\left[\mathrm{As}{\left({\mathrm{Mo}}_3{\mathrm{O}}_{10}\right)}_4\right]$

Q. Which among the following metal carbonyls are diamagnetic inner orbital complexes?
$\left(I\right)Ni(CO{)}_4$
$\left(II\right)Fe(CO{)}_5$
$\left(III\right)V(CO{)}_6$
$\left(IV\right)Cr(CO{)}_6$
Select the correct answer from the codes given below:

1. I and II only
2. II, III and IV only
3. II and IV only
4. I, II and IV only

Q.

Is ${\mathrm{S}}_2{\mathrm{O}}_3$ ambidentate?

Q. The shape of the complex[Ag(NH3)2]^+

Q.

The number of generators of an infinite cyclic group is

1. $1$

2. $3$

3. $2$

4. Infinite

Q.

If the magnetic moment of a dioxygen species is 1.73 B.M, it may be:

1. ${\mathrm{O}}_2,{{\mathrm{O}}_2}^{–},\mathrm{or}{{\mathrm{O}}_2}^{+}$

2. ${{\mathrm{O}}_2}^{–},\mathrm{or}{{\mathrm{O}}_2}^{+}$

3. ${\mathrm{O}}_2\mathrm{or}{{\mathrm{O}}_2}^{–}$

4. ${\mathrm{O}}_2,{{\mathrm{O}}_2}^{+}$

Q. The volume of carbon dioxide gas evolved at STP by heating 7.3 gm of Mg (HCO3)2 will be