Question
What is abnormal molar mass? Explain.
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Answer
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Match the property given in Column I with the element given in Column II.
| | Column I (Property) | | Column II (Element) |
| (i) | Lanthanoid which shows +4 oxidation state | (a) | Pm |
| (ii) | Lanthanoid which can show +2 oxidation state | (b) | Ce |
| (iii) | Radioactive lanthanoid | (c) | Lu |
| (iv) | Lanthanoid which has 4f7 electronic configuration in +3 oxidation state | (d) | Eu |
| (v) | Lanthanoid which has 4f14 electronic configuration in +3 oxidation state | (e) | Gd |
| | | (f) | Dy |
The rate constant for the decomposition of N2O5 at various temperatures is given below:
Draw a graph between ln k and 1/T and calculate the values of A and Ea. Predict the rate constant at 30° and 50°C.
| T/°C | 0 | 20 | 40 | 60 | 80 |
| 105 × k/s-1 | 0.0787 | 1.70 | 25.7 | 178 | 2140 |
- Account for the following:
- Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4.
- Cr2+ is a strong reducing agent.
- Cu2+ salts are coloured while Zn2+ salts are white.
- Complete the following equations:
- $2\text{MnO}_{2} + 4\text{KOH} + \text{O}_{2} \xrightarrow{\Delta}$
- $\text{Cr}_{2}\text{O}^{2-}_{7}+ 14\text{H}^{+} + 6\text{I}^{-}\rightarrow.$
Primary alkyl halide C4H9Br (a) reacted with alcoholic KOH to give compound (b). Compound (b) is reacted with HBr to give (c) which is an isomer of (a). When (a) is reacted with sodium metal it gives compound (d), C8H18 which is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of (a) and write the equations for all the reactions.
Give reasons for the following:
On electrolysis in acidic solution amino acids migrate towards cathode, while in alkaline solution these migrate towards anode.
On electrolysis in acidic solution amino acids migrate towards cathode, while in alkaline solution these migrate towards anode.
Explain primary, secondary and tertiary structure of proteins with diagram.
How can you remove the hard calcium carbonate layer of the egg without damaging its semiprermiable membrane? Can this egg be inserted into a bottle with a narrow neck without distorting its shape? Explain the process involved.
The activation energy of a reaction is 75.2kJ mol-1 in the absence of a catalyst and it lowers to 50.14kJ mol-1with a catalyst. How many times will the rate of reaction grow in the presence of a catalyst if the reaction proceeds at 25°C?