Magnetic Nature

Q.

[NiCl₄]²⁻ is paramagnetic while [Ni(CO)₄] is diamagnetic though both are tetrahedral. Why?

Q.

[Fe(H₂O)₆]³⁺ is strongly paramagnetic whereas [Fe(CN)₆]³⁻ is weakly paramagnetic. Explain.

Q. The complex showing a spin only magnetic moment of $2.82$ BM is:

1. $Ni(CO{)}_4$
2. $[NiC{l}_4{]}^{2-}$
3. $Ni(PP{h}_3{)}_4$
4. $\left[Ni\right(CN{)}_4{]}^{2-}$

Q.

The one that can exhibit the highest paramagnetic behavior among the following is:

1. ${\left[\mathrm{Ti}{\left({\mathrm{NH}}_3\right)}_6\right]}^{+3}$

2. ${\left[\mathrm{Co}{\left(\mathrm{OX}\right)}_2{\left(\mathrm{OH}\right)}_2\right]}^{-}$

3. $\left[\mathrm{Pd}{\left(\mathrm{gly}\right)}_2\right]$

4. ${\left[\mathrm{Fe}\left(\mathrm{en}\right)\left(\mathrm{bpy}\right){\left({\mathrm{NH}}_3\right)}_2\right]}^{+2}$

Q. The paramagnetic species among the following is:
$N{a}^{+},Z{n}^{2+},C{u}^{+},F{e}^{3+}$

1. $N{a}^{+}$
2. $Z{n}^{2+}$
3. $C{u}^{+}$
4. $F{e}^{3+}$

Q.

Question 28

Diamagnetic species are those which contain no unpaired electrons. Which among the following are diamagnetic?

(a) $N_2$

(b) $N_2^{2-}$

(c) $O_2$

(d) $O_2^{2-}$

Q. Among the following species
$N_2,N_2^{+},N_2^{-},N_2^{2-},O_2,O_2^{+},O_2^{-},O_2^{2-}$
the number of species showing diamagnetism is

Q. Which of the following pair is not isoelectronic species?
$(At.no.Sm,62;Er,68;Yb,70;Lu,71;Eu,63;Tb,65;Tm,69)$

1. $T{b}^{2+}$ and $T{m}^{4+}$
2. $Y{b}^{2+}$ and $L{u}^{3+}$
3. $S{m}^{2+}$ and $E{r}^{3+}$
4. $E{u}^{2+}$ and $T{b}^{4+}$

Q.

Is P paramagnetic or diamagnetic?

Q. Among $H_2,H_2^{+},L{i}_2,B{e}_2,B_2,C_2,O_2^{-},$, $N_2$, and$F_2$ the number of diamagnetic species are: (Atomic numbers: $H=1,He=2,Li=3,Be=4,B=5,C=6,N=7,O=8,F=9)$

Q. $N_2$ and $O_2$ are converted to monopositive cations $N_2^{+}$ and $O_2^{+}$ respectively. Which is incorrect?

1. In $N_2^{+}$, the $N-N$ bond is weakened
2. In $O_2^{+}$, the bond order increases
3. In $O_2^{+}$, the paramagnetism decreases
4. $N_2^{+}$ becomes diamagnetic

Q. Bond orders of $O_2,O_2^{-},O_2^{2-},O_2^{+}$ and $O_2^{2+}$ in increasing order are :

1. $O_2^{-}<O_2<O_2^{+}<O_2^{2+}<O_2^{2-}$
2. $O_2^{2-}<O_2^{+}<O_2^{2+}<O_2^{-}<O_2$
3. $O_2^{2-}<O_2^{-}<O_2<O_2^{+}<O_2^{2+}$
4. None of these

Q. Which one of the following complexes has largest value of ${\Delta }_0?$

1. $\left[Cr\right(H_{2}O{)}_6{]}^{+2}$
2. $\left[Cr\right(H_{2}O{)}_6{]}^{+3}$
3. $\left[Mn\right(H_{2}O{)}_6{]}^{+2}$
4. $\left[Mn\right(H_{2}O{)}_6{]}^{+3}$

Q. Why is water diamagnetic

Q. Which of the following statements is incorrect?

1. The peroxide ion has a bond order of one
2. The peroxide ion has a weaker bond than the oxygen molecule
3. The peroxide ion as well as the dioxygen molecule are paramagnetic
4. The bond length of peroxide ion is greater than that of the dioxygen molecule

Q. The magnetic moment of $K\left[Fe\right(CN{)}_5\left(NO\right)]$ is :

1. 1.73 B.M
2. 5.47 BM
3. 6.9 B.M
4. zero

Q. Calculate the spin only magnetic moment of $F{e}^{2+}$.[ At. no. = 26]

Q.

Oxygen molecule is paramagnetic because

1. Bonding electrons are more than antibonding electrons

2. Contains unpaired electrons

3. Bonding electrons are less than antibonding electrons

4. Bonding electrons are equal to antibonding electrons

Q. Give the Molecular Orbital Energy diagram of a) $N_2$ and b)$O_2$. Calculate the respective bond order. Write the magnetic nature of $N_2$ and $O_2$ molecules.

Q. Which of the following species is/are diamagnetic
(I) $O_2^{+}$ (II) $O_2$
(I) $O_2^{-}$ (II) $O_2^{2-}$

1. $O_2^{-},O_2^{+}$
2. $O_2$ and $O_2^{2-}$
3. $O_2^{2-}$ only
4. $O_2^{+},O_2^{-2}$

Q. Which of the following species is not paramagnetic?

1. $CO$
2. $O_2$
3. $B_2$
4. $NO$

Q. The paramagnatic property of the oxygen molecule due to the presence of unpaired electrons present in:

1. $(\sigma 2p_x{)}^1$ and $({\sigma }^{\ast }2p_x{)}^1$
2. $(\sigma 2p_x{)}^1$ and $(\pi 2p_y{)}^1$
3. $({\pi }^{\ast }2p_y{)}^1$ and $({\pi }^{\ast }2p_x{)}^1$
4. $({\pi }^{\ast }2p_y{)}^1$ and $(\pi 2p_y{)}^1$

Q. Equivalent weight of $Fe{S}_2$ [mol.wt = M] in the following reaction is?
$Fe{S}_2+O_2\to F{e}_2{O}_3+S{O}_2$

1. $\frac{M}{2}$
2. $\frac{M}{4}$
3. $\frac{M}{11}$
4. $\frac{M}{14}$

Q. Which of the following ion is not diamagnetic?

1. 
2. Sc³⁺
3. Mg²⁺
4. 

Q. In the following reaction ,
$A{s}_2{S}_3+H^{+}+N{O}_3^{-}\to .NO+H_{2}O+As{O}_4^{3-}+S{O}_4^{2-}$
The equivalent weight of $A{s}_2{S}_3$ is related to its molecular weight by:

Q.

Which of the following ion is diamagnetic?

1. Zn${}^{+2}$
2. Fe${}^{+3}$
3. Cr${}^{+3}$
4. Mn${}^{+2}$

Q. When $N_2$ goes to $N_2^{+}$, the $N-N$ bond distance increases and when $O_2$ goes to $O_2^{+}$; $O-O$ bond distance decreases.

Q. The calculated magnetic moment of a divalent ion of an atom with atomic number $24$ in aqueous solution is

1. $4.90BM$
2. $5.92BM$
3. $3.87BM$
4. $2.84BM$
5. $1.73BM$

Q. Which of the following molecules/species have identical bond order and same magnetic properties?

1. (I), (II) only
2. (I) and (III) only
3. (I), (II) and (III)
4. (II) and (III) only

Q. Which of the following molecules is paramagnetic in nature?

1. $L{i}_2$
2. $H_2$
3. $B_2$
4. $N_2$