Question
Magnetic properties of coordination compounds. Explain in detail.
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(a). A purple colour compound A, which is a strong oxidising agent and used for bleaching of wool, cotton, silk and other textile fibres was added to each of the three test tubes along with H2SO4. It was followed by strong heating.
In which of the above test tubes; A, B or C:
(i) Violet vapours will be formed
(ii) The bubbles of gas evolved will extinguish a burning matchstick. Write an equation for each of the above observations.
b. A metal ion Mn+ of the first transition series having d5 configuration combines with three didentate ligands. Assuming $\Delta_0$< P:
(i) Draw the crystal field energy level diagram for the 3d orbital of this complex.
(ii) What is the hybridisation of Mnt in this complex and why?
(iii) Name the type of isomerism exhibited by this complex.
→In which of the above test tubes; A, B or C:
(i) Violet vapours will be formed
(ii) The bubbles of gas evolved will extinguish a burning matchstick. Write an equation for each of the above observations.
b. A metal ion Mn+ of the first transition series having d5 configuration combines with three didentate ligands. Assuming $\Delta_0$< P:
(i) Draw the crystal field energy level diagram for the 3d orbital of this complex.
(ii) What is the hybridisation of Mnt in this complex and why?
(iii) Name the type of isomerism exhibited by this complex.
Write the Nernst equation and emf of the following cells at 298 K :
(i) $Mg ( s )\left| Mg ^{2+}(0.001 M )|| Cu ^{2+}(0.0001 M )\right| Cu ( s )$
(ii) $Fe ( s )\left| Fe ^{2+}(0.001 M )|| H ^{+}(1 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iii) $Sn ( s )\left| Sn ^{2+}(0.050 M )||H ^{+}(0.020 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iv) $\operatorname{Pt}( s )|\overline{\operatorname{B}}r(0.010 M )|Br _{2(l)}||H ^{+}(0.030 M )|$ $H _2(g)(1 bar ) \mid Pt ( s )$.
→(i) $Mg ( s )\left| Mg ^{2+}(0.001 M )|| Cu ^{2+}(0.0001 M )\right| Cu ( s )$
(ii) $Fe ( s )\left| Fe ^{2+}(0.001 M )|| H ^{+}(1 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iii) $Sn ( s )\left| Sn ^{2+}(0.050 M )||H ^{+}(0.020 M )\right| H _2(g)(1 bar ) \mid Pt ( s )$
(iv) $\operatorname{Pt}( s )|\overline{\operatorname{B}}r(0.010 M )|Br _{2(l)}||H ^{+}(0.030 M )|$ $H _2(g)(1 bar ) \mid Pt ( s )$.
- Account for the following:
- Mn2O7 is acidic whereas MnO is basic.
- Though copper has completely filled d-orbital (d10) yet it is considered as a transition metal.
- Actinoids show wide range of oxidation states.
- Write the preparation of potassium permanganate from pyrolusite ore (MnO2).
[A], [B], [C], [D], [E], [F] and [G] are amines each of which forms a hydrochloride containing 32.42% chlorine. [A], [B], [C] and [D] evolve N2 on reaction with HNO2, but [E], [F], [G] and [H] do not. Give structures of [A] to [H] with reasons.
Classify carbohydrates and also give examples of each.
Write difference between Phenol and Alcohol.
The experimental data for decomposition of N2O5
$\left[2 N_2 O _5 \rightarrow 4 NO _2+ O _2\right]$
in gas phase at 318 K are given below :
(i) Plot [N2O5] against t.
(ii) Find the half-life period for the reaction.
(iii) Draw a graph between log[N2O5] and t.
(iv) What is the rate law?
(v) Calculate the rate constant.
(iv) Calculate the half-life period from k and compare it with (ii).
→$\left[2 N_2 O _5 \rightarrow 4 NO _2+ O _2\right]$
in gas phase at 318 K are given below :
| t/s | $10^{-2} \times\left[ N _2 O _5\right] / mol L ^{-1}$ |
| 0 | 1.63 |
| 400 | 1.36 |
| 800 | 1.14 |
| 1200 | 0.93 |
| 1600 | 0.78 |
| 2000 | 0.64 |
| 2400 | 0.53 |
| 2800 | 0.43 |
| 3200 | 0.35 |
(i) Plot [N2O5] against t.
(ii) Find the half-life period for the reaction.
(iii) Draw a graph between log[N2O5] and t.
(iv) What is the rate law?
(v) Calculate the rate constant.
(iv) Calculate the half-life period from k and compare it with (ii).
What are the similarities between lanthanoids and actinoids?
How will you convert :
(i) Ethanoic acid into methanamine
(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine
(i) Ethanoic acid into methanamine
(ii) Hexanenitrile into 1-aminopentane
(iii) Methanol to ethanoic acid
(iv) Ethanamine into methanamine
Calculate the standard cell potentials of galvanic cell in which the following reactions take place :
(i) $2 Cr ( s )+3 Cd ^{2+}( aq ) \rightarrow 2 Cr ^{3+}( aq )+3 Cd ( s )$
(ii) $Fe ^{2+}$ (aq) $+ Ag ^{+}$(aq) $\rightarrow Fe ^{3+}$ (aq) + Ag (s)
Calculate the $\Delta_r G^{\circ}$ and equilibrium constant of the reactions.
→(i) $2 Cr ( s )+3 Cd ^{2+}( aq ) \rightarrow 2 Cr ^{3+}( aq )+3 Cd ( s )$
(ii) $Fe ^{2+}$ (aq) $+ Ag ^{+}$(aq) $\rightarrow Fe ^{3+}$ (aq) + Ag (s)
Calculate the $\Delta_r G^{\circ}$ and equilibrium constant of the reactions.