Question
What is resonance effect and it is of how many types? Explain with examples.
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Answer
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Balance the following ionic equations.
$\text{Cr}_2\text{O}^{2-}_7+\text{Fe}^{2+}+\text{H}^+\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Cr}^{3+}+\text{Fe}^{3+}+\text{H}_2\text{O}$
→$\text{Cr}_2\text{O}^{2-}_7+\text{Fe}^{2+}+\text{H}^+\xrightarrow{ \ \ \ \ \ \ \ \ }\text{Cr}^{3+}+\text{Fe}^{3+}+\text{H}_2\text{O}$
Discuss the factors affecting electron gain enthalpy and the trend in its variation in the periodic table.
Explain with examples the terms necessary to determine the pH of weak electrolyte solution.
Explain the general mechanism of electrophilic substitution of benzene.
Explain the stability of benzene by resonance and molecular orbital diagram.
The solubility product of lead bromide is 8 × 10-5 at 298K. If the salt is 80% dissociated in saturated solution, calculate the solubility of the salt (in g/ L).
A compound made up of two elements A and B has A = 70%, B = 30%. Their relative number of moles in the compound are 1.25 and 1.88. Calculate.
- Atomic masses of the elements A and B.
- Molecular formula of the compound, if its molecular mass is found to be 160.
$2\text{NO}(\text{g})+\text{O}_2(\text{g})\rightleftharpoons2\text{NO}_2(\text{g});\Delta\text{H}=-17\text{KJ}$
→- Predict the effect of an increase in concentration of NO on the equilibrium concentration of NO2.
- Predict the effect of pressure decrease as a result of increased volume on the equilibrium concentration of NO2.
Attempt any five of the following:
1. What is electrophile in sulphonation?
2. Write IUPAC name of following:
3. Write IUPAC name: $CH _3 CH - C \left( CH _3\right)_2$
4. Methane does not react with chlorine in dark. Why?
5. How would you convert ethene to ethane molecule?
6. What is Huckel rule?
7. What is decarboxylation? Give an example.
→1. What is electrophile in sulphonation?
2. Write IUPAC name of following:
3. Write IUPAC name: $CH _3 CH - C \left( CH _3\right)_2$
4. Methane does not react with chlorine in dark. Why?
5. How would you convert ethene to ethane molecule?
6. What is Huckel rule?
7. What is decarboxylation? Give an example.
Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, $\text{Cr}_2\text{O}^{2-}_7$ and $\text{NO}^{-}_3.$ Suggest structure of these compounds. Count for the fallacy.
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