Question
What are the similarities between lanthanoids and actinoids?
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Explain the terms primary and secondary structure of proteins. What is the difference between α-helix and β-pleated sheet structure of proteins?
Match the compounds given in Column I with the oxidation state of cobalt present in it (given in Column II) and assign the correct code.
| | Column I (Compound) | | Column II (Oxidation state of Co) |
| a. | [Co(NCS)(NH3)5](SO3) | 1. | +4 |
| b. | [Co(NH3)4Cl2]SO4 | 2. | 0 |
| c. | Na4[Co(S2O3)3] | 3. | +1 |
| d. | [Co2(CO)8] | 4. | +2 |
| | | 5. | +3 |
Code:
- A (1), B (2), C (4), D (5).
- A (4), B (3), C (2), D (1).
- A (5), B (1), C (4), D (2).
- A (4), B (1), C (2), D (3).
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) $\operatorname{Pt}( s )|\overline{\operatorname{B}}r(0.010 M )|Br _{2(l)}||H ^{+}(0.030 M )|$ $H _2(g)(1 bar ) \mid Pt ( s )$.
Give the electronic configuration of the following complexes on the basis of Crystal Field Splitting theory.
[CoF6]3-, [Fe(CN)6]4- and [Cu(NH3)6]2+
[CoF6]3-, [Fe(CN)6]4- and [Cu(NH3)6]2+
What is imperfections? How many types of its? Explain.
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.
The rate constant for the decompositon of N2O5 at various temperatures is given below :
Draw a graph between In k and 1/T and calculate the values of A and Ea. Predict the rate constant at $30^{\circ}$ and $50^{\circ}C$.
→| $T /{ }^{\circ} C$ | 0 | 20 | 40 | 60 | 80 |
| $10^5 \times k / s ^{-1}$ | 0.0787 | 1.70 | 25.7 | 178 | 2140 |
Answer the following question:
The graphical representation of vapour pressures of two component system as a function of composition is given alongside. By graphic inspection, answer the following questions:
→The graphical representation of vapour pressures of two component system as a function of composition is given alongside. By graphic inspection, answer the following questions:
- Are the A-B interactions weaker, stronger or of the same magnitude as A-A and B-B?
- Name the type of deviation shown by this system from Raoult’s law.
- Predict the sign of $\Delta_\text{mix}\text{H}$ for this system.
- Predict the sign of $\Delta_\text{mix}\text{H}$ for this system.
- Give an example of such a system.
- What type of azeotrope will this system form, if possible?
What is the difference between osmosis and diffusion?
Explain valence bond theory for coordination compounds.