Square Planar Complexes

Q. Calculate the Crystal Field Stabilization Energy (CFSE) of $[Co{F}_6{]}^{3-}$.

1. $-0.6{\Delta }_t$
2. $0.6{\Delta }_t$
3. $-0.4{\Delta }_o$
4. $0.4{\Delta }_o$

Q.

The hybridization of $\mathrm{Ni}{\left(\mathrm{CO}\right)}_4$is

1. $ds{p}^2$

2. $s{p}^2$

3. $s{p}^{3}d$

4. $s{p}^3$

Q. Assertion
Tetrahedral complexes do not show geometrical isomerism.

Reason
The relative positions of the ligands in the tetrahedral complex are the same w.r.t each other.

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

Q.

Magnetic permeability is maximum for

1. diamagnetic substances

2. paramagnetic substances

3. ferromagnetic substances

4. all of these

Q. Given below are two statements:
Statement I: $\left[Ni\right(CN{)}_4{]}^{2–}$ is square planar and diamagnetic complex, with $ds{p}^2$ hybridization for $Ni$ but $\left[Ni\right(CO{)}_4]$ is tetrahedral, paramagnetic and with $s{p}^3$-hybridization for $Ni$.
Statement II: $[NiC{l}_4{]}^{2–}$ and $\left[Ni\right(CO{)}_4]$ both have same d-electron configuration, have same geometry and are paramagnetic.

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

Q. (i)Draw the geometrical isomers of complex $\left[Co\right(en{)}_{2}C{l}_2{]}^{+}.$

(ii) On the basis of crystal field teory, write the electronic configuration for $d^4$ ion if ${\Delta }_0>P.$

(iii) $[NiC{l}_4{]}^{2-}$ is paramagnetic while $\left[Ni\right(CO{)}_4]$ is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni =28)

Q. Select the correct statements about diborane:

1. $B_2{H}_6$ has three centred two electron bond
2. Each boron atom lies in $s{p}^3$ hyrid state
3. Terminal $H...B...H$ bond angle is ${120}^{\circ }$
4. All hydrogen in $B_2{H}_6$ lie in the same plane

Q. The correct increasing order of trans-effect of the following species is

1. $N{H}_3>C{N}^{-}>B{r}^{-}>C_6{H}_5^{-}$
2. $C{N}^{-}>C_6{H}_5^{-}>B{r}^{-}>N{H}_3$
3. $C{N}^{-}>B{r}^{-}>C_6{H}_5^{-}>N{H}_3$
4. $B{r}^{-}>C{N}^{-}>N{H}_3>C_6{H}_5^{-}$

Q. Are prefixes like bis, tris, tetrakis, etc. considered in alphabetical order in nomenclature of coordination compounds?

Q. Which ion has the lowest radius from the following ions

1. Mg²⁺
2. Al³⁺
3. Si⁴⁺
4. Na⁺

Q. Choose the correct statement(s) among the following:

1. ${\left[FeC{l}_4\right]}^{-}$has higher spin-only magnetic moment than ${\left[Co\right(en\left){\left(N{H}_3\right)}_{2}C{l}_2\right]}^{+}$.
2. ${\left[Co\right(en\left){\left(N{H}_3\right)}_{2}C{l}_2\right]}^{+}$ has $2$ geometrical isomers
3. The cobalt ion in ${\left[Co\right(en\left){\left(N{H}_3\right)}_{2}C{l}_2\right]}^{+}$ has $s{p}^3{d}^2$ hybridization.
4. ${\left[FeC{l}_4\right]}^{-}$ has tetrahedral geometry

Q. Predict the number of unpaired electrons in the complex ion $[CoC{l}_4{]}^{2-}$, expected for the tetrahedral complex ion.

Q.

1. True
2. False

Q. Which of the following compound (s) show(s) optical isomerism?
$\text{en- Ethylenediamine}\text{bn- Butylenediamine}\text{gly- Gylcinate}$

1. $\left[Pt\right(bn{)}_2{]}^{2+}$
2. $\left[CrC{l}_2\right(en{)}_2{]}^{+}$
3. $\left[Co\right(en{)}_3\left]\right[Co{F}_6]$
4. $\left[Zn\right(gly{)}_2]$

Q. At curie temperature:

1. The ferrimagnetism property changes to ferromagnetism
2. The ferromagnetism property changes to ferrimagnetism
3. The ferromagnetism property changes to paramagnetism
4. Magnetic property does not change.

Q. Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?

1. $SC{N}^{-}<F^{-}<C{N}^{-}<C_2{O}_4^{2-}$
2. $F^{-}<SC{N}^{-}<C_2{O}_4^{2-}<C{N}^{-}$
3. $SC{N}^{-}<F^{-}<C_2{O}_4^{-}<C{N}^{-}$
4. $C{N}^{-}<C_2{O}_4^{2-}<SC{N}^{-}{F}^{-}$

Q. Bond-order of $H{e}_2^{+}$ is _____ but it is paramagnetic due to _____

1. $0.5$, one unpaired electron
2. $1$, one unpaired electron
3. $0.5$, no unpaired electron
4. $1$, two unpaired electron

Q. A substance which is not paramagnetic is :

1. $VOB{r}_2$
2. $KMn{O}_4$
3. $Cr(Cl{O}_4{)}_3$
4. $TiC{l}_3$

Q. Number of species among the following which have a bond order of $1.5$ and are paramagnetic as well are

Q. "$H{e}_2$ does not exist since its bond-order is zero."
Answer whether the above statement is true or false.

Q. Which one of the following molecules is paramagnetic?

1. $N_2$
2. $O_3$
3. $NO$
4. $CO$

Q. Among $Ni\left(C{O}_4\right)$ , $Ni(CN{)}_4^{2-}$ and $Ni\left(C{l}_4^{2-}\right)$ :

1. $Ni\left(C{l}_4^{2-}\right)$ and $Ni(CN{)}_4^{2-}$ are diamagnetic and $Ni\left(C{O}_4\right)$ is paramagnetic
2. $Ni\left(C{O}_4\right)$ and $Ni(CN{)}_4^{2-}$ are diamagnetic and $Ni\left(C{l}_4^{2-}\right)$ is paramagnetic
3. $Ni\left(C{O}_4\right)$ and $Ni\left(C{l}_4^{2-}\right)$ are diamagnetic and $Ni(CN{)}_4^{2-}$ is paramagnetic
4. $Ni\left(C{O}_4\right)$ is diamagnetic and $Ni\left(C{l}_4^{2-}\right)$ and $Ni(CN{)}_4^{2-}$ are paramagnetic

Q. For a hydrogen like ion $H{e}^{+}$, there is a dumb-belled symmetric state A with 2 radial nodes in excited state. The final state after de-excitation was found to be ground state of H - atom.
How many electrons with spin quantum number $m_s=-\frac{1}{2}$ can be placed in A?

1. 14
2. 2
3. 3
4. 10

Q. Compare the complexes ${\left[Fe{\left(H_{2}O\right)}_6\right]}^{2+}$ and ${\left[Fe{\left(CN\right)}_6\right]}^{4-}$ with the help of crystal field theory.

Q. The structure of the complex $\left[Pt\right(N{H}_3{)}_4{]}^{2+}$ is

1. Pyramidal
2. Pentagonal
3. Square planar
4. Tetrahedral

Q. Among $\left[Ni\right(CO{)}_4],$ $NiC{l}_4{]}^{2-}$, $\left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl$, $N{a}_3\left[Co{F}_6\right],$ $N{a}_2{O}_2$ and $Cs{O}_2$, the total number of paramagnetic compounds is:

1. $2$
2. $3$
3. $4$
4. $5$

Q. In which of the following molecules or ions, removal of one electron will increase the bond order and at the same time, make them diamagnetic from paramagnetic?

1. $C{N}^{-}$
2. $NO$
   
3. $N_2$
   
4. $O_2$
   

Q. Decreasing order of p-orbital character in the following is:
A) $Si{O}_2$ B) $C{O}_2$ C) Graphite

1. A>B>C
2. B>A>C
3. B>C>A
4. A>C>B

Q.

1. True
2. False

Q. The tetrahedral complex which is diamagnetic but coloured :

1. ${\left[NiC{l}_4\right]}^{2-}$
2. ${\left[Cr{O}_4\right]}^{2-}$
3. ${\left[Mn{O}_4\right]}^{2-}$
4. ${\left[Cd{\left(CN\right)}_4\right]}^{2-}$