Question
Explain valence bond theory for coordination compounds.
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For the decomposition of azoisopropane to hexane and nitrogen at 543 K , the following data is obtained :
Calculate the rate constant.
→| $t( sec )$ | $P$ (mm of Hg ) |
| 0 | 35.0 |
| 360 | 54.0 |
| 720 | 63.0 |
Calculate the rate constant.
Explain why on addition of 1mol of NaCl to 1 litre of water, the boiling point of water increases, while addition of 1mol of methyl alcohol to one litre of water decreases its boiling point.
Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration, and coordination number. Also, give stereochemistry and magnetic moment of the complex:
a. $\left.K \left[ Cr \left( H _2 O \right)_2\right\}\left( C _2 O _4\right)_2\right] \cdot 3 H _2 O$
b. $\left[ Co \left( NH _3\right)_5 Cl \right] Cl _2$
c. $CrCl _3( py )_3$
d. $Cs \left[ FeCl _4\right]$
e. $K _4\left[ Mn ( CN )_6\right]$
→a. $\left.K \left[ Cr \left( H _2 O \right)_2\right\}\left( C _2 O _4\right)_2\right] \cdot 3 H _2 O$
b. $\left[ Co \left( NH _3\right)_5 Cl \right] Cl _2$
c. $CrCl _3( py )_3$
d. $Cs \left[ FeCl _4\right]$
e. $K _4\left[ Mn ( CN )_6\right]$
- What may be the possible oxidation states of the transition metals with the following d electronic configurations in the ground state of their atoms:
- $3d^34s^2, 3d^54s^2$ and $3d^6 4s^3$. Indicate relative stability of oxidation states in each case.
- Write steps involved in the preparation of $(i) Na_2CrO_4$ from chromite ore and $(ii) K_2MnO_4$ from pyrolusite ore.
Match the items of Column $I$ and Column $II.$
→|
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Column $I$
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Column $II$
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| $i.$ |
Lechlanche cell
|
$a.$ |
Cell reaction $2H_2 + O_2 ⎯\rightarrow 2H_2O$
|
| $ii.$ |
$Ni–Cd$ cell
|
$b.$ |
Does not involve any ion in solution and is used in hearing aids.
|
| $iii.$ |
Fuel cell
|
$c.$ |
Rechargeable.
|
| $iv.$ |
Mercury cell
|
$d.$ |
Reaction at anode, $Zn ⎯\rightarrow Zn^{2+} + 2e^-$
|
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$e.$ |
Converts energy of combustion into electrical energy.
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(a) Differentiate between
a. Nucleotide and Nucleoside
b. Amylose and Amylopectin
(b) Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain.
(c) Write two differences between DNA and RNA.
(d) Amino acids can be classified as $\alpha-, \beta-, \gamma-, \delta-$ and so on depending upon the relative position of the amino group with respect to the carboxyl group. Which type of amino acids forms a polypeptide chain in proteins?
(e) What are any two good sources of vitamin A?
(f) What is anomeric carbon?
(g) What is the difference between a glycosidic linkage and a peptide linkage?
→a. Nucleotide and Nucleoside
b. Amylose and Amylopectin
(b) Write a reaction which shows that all the carbon atoms in glucose are linked in a straight chain.
(c) Write two differences between DNA and RNA.
(d) Amino acids can be classified as $\alpha-, \beta-, \gamma-, \delta-$ and so on depending upon the relative position of the amino group with respect to the carboxyl group. Which type of amino acids forms a polypeptide chain in proteins?
(e) What are any two good sources of vitamin A?
(f) What is anomeric carbon?
(g) What is the difference between a glycosidic linkage and a peptide linkage?
Answer the following questions:
Assign reasons for the following:
→Assign reasons for the following:
- In the series $\ce{Sc (Z = 21) to Zn (Z = 30)}$, the enthalpy of atomisation of $Zn$ is the lowest.
- $Zr$ and Hf have almost identical radii.
- Transition metals show variable oxidation states.
- The $E^\circ M^{2+}/M$ value for copper is positive $(+0.34 V).$
- The acid strength of alcohols decreases in the order
- Phenol is more easily nitrated than benzene.
Answer the following question:
Calculate the molality of a sulphuric acid solution in which the mole fraction of water is 0.85.
Calculate the molality of a sulphuric acid solution in which the mole fraction of water is 0.85.
An organic compound with molecular formula $C _9 H _{10} O$ forms 2,4-DNP derivative, reduces Tollen's reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzenedicarboxylic acid. Identify the compound.
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