Question
Explain in brief aromaticity.
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Answer
SELF
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Calculate the enthalpy change on freezing of 1.0 mol of water at $10.0^{\circ} C$ to ice at $-10.0^{\circ} C$.
$\Delta_{\text {fus }} H=6.03 kJ mol^{-1} \text { at } 0^{\circ} C .$
$C_{p}\left[H_2 O(l)\right]=75.3 J mol^{-1} K^{-1}$
$C_{p}\left[H_2 O(s)\right]=36.8 J mol^{-1} K^{-1}$
→$\Delta_{\text {fus }} H=6.03 kJ mol^{-1} \text { at } 0^{\circ} C .$
$C_{p}\left[H_2 O(l)\right]=75.3 J mol^{-1} K^{-1}$
$C_{p}\left[H_2 O(s)\right]=36.8 J mol^{-1} K^{-1}$
According to molecular orbital theory, how many types of molecular orbitals are there? How are they formed and also tell the order of energy of molecular orbitals formed form different atomic orbitals?
How do you count for the following observations?
Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.
Though alkaline potassium permanganate and acidic potassium permanganate both are used as oxidants, yet in the manufacture of benzoic acid from toluene we use alcoholic potassium permanganate as an oxidant. Why? Write a balanced redox equation for the reaction.
Match Column I with Column II.
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Column I
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Column II
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(i)
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Dumas method.
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(a)
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$\mathrm{AgNO}_3$ |
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(ii)
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Kjeldahl’s method.
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(b)
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Silica gel.
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(iii)
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Carius method.
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(c)
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Nitrogen gas.
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(iv)
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Chromatography
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(d)
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Free radicals.
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(v)
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Homolysis
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(e)
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Ammonium sulphate.
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1. Give IUPAC names of the following structures.
2. Benzoic acid is an organic compound. Its crude sample can be purified by crystallization from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?
2. Benzoic acid is an organic compound. Its crude sample can be purified by crystallization from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?
Explain the IUPAC nomenclature system of unsaturated hydrocarbon with example.
An aqueous solution contains an unknown concentration of $Ba ^{2+}$. When 50 mL of 1 M solution of $Na _2 SO _4$ is added, $BaSO _4$ first begin to precipitate. The final volume is $500 mL$ . The solubility product of $BaSO _4$ is $1.0 \times 10^{-10}$. What is original concentration of $Ba ^{2+}$ ?
→Discuss the concept of hybridisation. What are its different types in a carbon atom.
- The reaction quotient of a reversible reaction is $Q_C$ and the equilibrium constant is $K_c$. What do you conclude for the reaction if $Q_c < K_c$?
- State Le Chatelier's principle.
- In qualitative analysis, $NH_4Cl$ is added before adding $NH_4OH$ solution for testing of III group radicals [$Fe^{3+}, Cr^{3+}$ and $Al^{3+}$]. Explain by using concept of common ion effect.
Explain the oxidation number method to balance the redox reaction with explain.