Question
Explain the general methods of preparation of amines.
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Answer
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For a certain chemical reaction variation in the concentration ln [R] vs. time plot is given alongside.
For this reaction:
- What is the order of the reaction?
- What are the units of rate constant k?
- Give the relationship between k and t1/2 (half-life period).
- What is the slope of the curve?
- Draw the plot log [R]0 /[R] vs time t(s).
Match the complex species given in Column I with the possible isomerism given in Column II and assign the correct code:
| | Column I (Complex species) | | Column II (Isomerism) |
| a. | [Co(NH3)4Cl2]+ | 1. | Optical |
| b. | cis-[Co(en)2Cl2]+ | 2. | Ionisation |
| c. | [Co(NH3)5 (NO2)]Cl2 | 3. | Coordination |
| d. | [Co(NH3)6][Cr(CN)6] | 4. | Geometrical |
| | | 5. | Linkage |
Code:
- A (1), B (2), C (4), D (5).
- A (4), B (3), C (2), D (1).
- A (4), B (1), C (5), D (3).
- A (4), B (1), C (2), D (3).
(a) What is reverse osmosis? How is water purified through it? Explain.
(b) Write the applications of osmosis.
(b) Write the applications of osmosis.
- Give reasons for the following:
- Mn3+ is a good oxidizing agent.
- Eo m2+/M values are not regular for first row transition metals. (3d series)
- Although ‘F’ is more electronegative then ‘O’, the highest Mn fluoride is Mnf4, whereas the highest oxide is Mn2O7.
- Complete the following equations:
$\text{2CrO}_{4}^{2}+\text{2H}^{+}\rightarrow$
$\text{KMnO}_{4}\xrightarrow{heat}$
Match the laws given in Column I with expresions given in Column II.
→| Column I | Column II | ||
| i. | Raoult’s law | a. | $\Delta\text{T}_\text{f}=\text{K}_\text{f}\text{m}$ |
| ii. | Henry’s law | b. | $\pi=\text{CRT}$ |
| iii. | Elevation of boiling point | c. | $\text{p}=\text{x}_1\text{p}^0_1+\text{x}_2\text{p}^0_2$ |
| iv. | Depression in freezing point | d. | $\Delta\text{T}_\text{b}=\text{K}_\text{b}\text{m}$ |
| v. | Osmotic pressure | e. | $\text{p}=\text{K}_\text{H}\cdot\text{x}$ |
Match the items of Column I and Column II.
| | Column I | | Column II |
| i. | Lechlanche cell | a. | Cell reaction 2H2 + O2 ⎯→ 2H2O |
| 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 ⎯→ Zn2+ + 2e- |
| | | e. | Converts energy of combustion into electrical energy. |
Write the chemical reactions of $C _2 H _5 OH$ with following compounds :
(i) $CH _2 N_2$ (diazomethane) (ii) ketone, (iii) $HC \equiv$ $C H$ (iv) $C H _3 N C O$ (Methyl-isocyanate) (v) $C H _3 C H O$ (ethanol) (vi) conc. $H _2 SO _4$ at $0^{\circ} C$.
→(i) $CH _2 N_2$ (diazomethane) (ii) ketone, (iii) $HC \equiv$ $C H$ (iv) $C H _3 N C O$ (Methyl-isocyanate) (v) $C H _3 C H O$ (ethanol) (vi) conc. $H _2 SO _4$ at $0^{\circ} C$.
Describe the mechanism of replication of DNA.
- 30 g of urea (M = 60 g mol-1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.
- Write two differences between ideal solutions and non-ideal solutions.
Explain the open chain structure of glucose.