Question
Magnetic properties of coordination compounds. Explain in detail.

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Specify the oxidation numbers of the metals in the following coordination entities:
i. $\left[ Co \left( H _2 O \right)( CN )( en )_2\right]^{2+}$
ii. $\left[ Pt ( Cl )_4\right]^{2-}$
iii. $K _3\left[ Fe ( CN )_6\right]$
iv. $\left[ Cr \left( NH _3\right)_3 Cl _3\right]$
Match the terms given in Column $I$ with the units given in Column $II.$
 
Column $I$
 
Column $II$
$i.$ $∧_m$ $a.$ $\ce{S cm^{-1}}$
$ii.$ $\ce{E}_{\ce{Cell}}$ $b.$ $m^-$
$iii.$ $K$ $c.$ $\ce{S cm^2 mol^{-1}}$
$iv.$ $G^*$ $d.$ $V$
Explain the methods of preparation of aromatic aldehydes (benzoic aldehyde) from aromatic hydrocarbons.
The rate constant for the first order decomposition of $\ce{H_2O_2}$ is given by the following equation:
$\log k = 14.34 – 1.25 \times 10^4K/T$
Calculate $E_a$ for this reaction and at what temperature will its half$-$period be $256$ minutes?
What is crystal field splitting energy? How does the magnitude of $\Delta_0$ decide the actual configuration of d-orbitals in a coordination entity?
Cyclobutyl bromide on treatment with magnesium in dry ether forms an organometallic A. The organometallic reacts with ethanol to give an alcohol B after mild acidification. Prolonged treatment of alcohol B with an equivalent of HBr gives 1-bromo-1-methyl cyclopentane $C$. Write the structures of $A, B$ and explain how the $C$ is obtained from B?
Describe the structure of a fuel cell. Draw labelled diagram of a structure of fuel cell?
Match the solutions given in Column $I$ and the colours given in Column $II.$
 
Column $I ($Aqueous solution of salt$)$
 
Column $II($Colour$)$
$(i)$ $\ce{FeSO_4.7H_2O}$ $(a)$
Green
$(ii)$ $\ce{NiCl_2.4H_2O}$ $(b)$
Light pink
$(iii)$ $\ce{MnCl_2.4H_2O}$ $(c)$
Blue
$(iv)$ $\ce{CoCl_2.6H_2O}$ $(d)$
Pale green
$(v)$ $\ce{Cu_2Cl_2}$ $(e)$
Pink
 
 
$(f)$
Colourless
Vapour pressures of pure acetone and chloroform at 328 K are 741.8 mm Hg and 632.8 mm Hg respectively. Assuming that they form ideal solution over the entire range of composition, plot $p_{\text {total }}, p_{\text {chloroform }}$ and $p_{\text {acetone }}$ as a function of $x_{\text {acetone }}$ The experimental data observed for different compositions of mixture is :
$100 \times x_{\text {acetone }}$011.823.436.050.858.264.572.1
$p_{\text {acetone }} / mm Hg$054.9110.1202.4322.7405.9454.1521.1
$p_{\text {chloroform }} / mm Hg$632.8548.1469.4359.7257.7193.6161.2120.7
Plot this data also on the same graph paper. Indicate whether it has positive deviation or negative deviation from the ideal solution.
(a) (i) Write the disproportionation reaction of $H _3 PO _3$.
(ii) Draw the structure of $XeF _4$.
(b) Account for the following:
(i) Although fluorine has less negative electron gain enthalpy yet $F_2$ is a strong oxidizing agent.
(ii) Acidic character decreases from $N _2 O _3$ to $Bi _2 O _3$ in group 15.
(c) Write a chemical reaction to test Sulphur dioxide gas. Write the chemical equation involved.