Question
- Draw the structures of the following molecules:
- $XeOF_4$
- $H_2SO_4$
- Write the structural difference between white phosphorus and red phosphorus.
✓
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In a pseudo first order hydrolysis of ester in water, the following results were obtained:
→| t/s | $0$ | $30$ | $60$ | $90$ |
| [Ester]/mol $L^{-1}$ | $0.55$ | $0.31$ | $0.17$ | $0.085$ |
- Calculate the average rate of reaction between the time interval $30 $to $60 $seconds.
- Calculate the pseudo first order rate constant for the hydrolysis of ester.
From the following molar conductivities at infinite dilution, calculate $\Lambda^0_{\text{m}}$ for $NH_4OH$.
$\Lambda^0_{\text{m}}\text{ for }\text{Ba(OH)}_2=457.6\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
$\Lambda^0_{\text{m}}\text{ for }\text{BaCl}_2=240.\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
$\Lambda^{0}_{\text{m}}\text{ for }\text{NH}_4\text{Cl}=129.8\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
→$\Lambda^0_{\text{m}}\text{ for }\text{Ba(OH)}_2=457.6\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
$\Lambda^0_{\text{m}}\text{ for }\text{BaCl}_2=240.\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
$\Lambda^{0}_{\text{m}}\text{ for }\text{NH}_4\text{Cl}=129.8\Omega^{-1}\text{cm}^2\text{mol}^{-1}$
At what pH of HCl solution will hydrogen gas electrode show electrode potential of $-0.118 V$ ? $\mathrm{H}_2$ gas is passed at $298 K$ and $1$ atm pressure.
→- What type of isomerism is shown by the complex $[Co(en)_3]Cl_3$?
- Write the hybridisation and magnetic character of $[Co(C_2O_4)_3]_3{}^–$.
- Write IUPAC name of the following Complex $[Cr(NH_3)_3Cl_3]$
Answer the following questions:
→- What is meant by chirality of a compound? Give an example.
- Which one of the following compounds is more easily hydrolyzed by KOH and why?
- Which one undergoes $S_N2$ substitution reaction faster and why?
The well known mineral fluorite is chemically calcium fluoride. It is known that in one unit cell of this mineral there are $4 \mathrm{Ca}^{2+}$ ions and $8 \mathrm{F}^{-}$ions and that $\mathrm{Ca}^{2+}$ ions are arranged in a fcc lattice. The $\mathrm{F}^{-}$ions fill all the tetrahedral holes in the face centred cubic lattice of $\mathrm{Ca}^{2+}$ ions. The edge of the unit cell is $5.46 \times 10^{-8} \mathrm{~cm}$ in length. The density of the solid is $3.18 \mathrm{~g} \mathrm{~cm}^{-3}$. Use this information to calculate Avogadro's number $($Molar mass of $\mathrm{CaF}_2=78.08 \mathrm{~g} \mathrm{~mol}^{-1} ).$
→ How can you determine the atomic mass of an unknown metal if you know its density and the dimension of its unit cell? Explain.
The decomposition of $\mathrm{NH}_3$ on platinum surface is zero order reaction. If rate constant $(\mathrm{k})$ is $4 \times 10^{-3} \mathrm{Ms}^{-1}$, how long will it take to reduce the initial concentration of $\mathrm{NH}_3$ from $0.1 M$ to $0.064 M$.
→Write chemical equations for the following conversions:
- Nitrobenzene to benzoic acid.
- Benzyl chloride to 2-phenylethanamine.
- Aniline to benzyl alcohol.
Define the following terms as related to proteins:
- Peptide linkage.
- Primary structure.
- Denaturation.