Question
What is quantum mechanics? Explain the Schrodinger wave equation for hydrogen.

Answer

SELF

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What are the necessary conditions for any system to be aromatic?
Describe the method, which can be used to separate two compounds with different solubilities in a solvent S.
Identify the substance oxidised reduced, oxidising agent and reducing agent for each of the following reactions:

  1. 2AgBr(s) + C6H6O2(aq) → 2Ag(s) + 2HBr(aq) + C6H4O2(aq)

  2. HCHO(l) + 2[Ag(NH3)2]+(aq) + 3OH-(aq) → 2Ag(s) + HCOO-(aq) + 4NH3(aq) + 2H2O(l)

  3. HCHO(l) + 2Cu2+(aq) + 5OH-(aq) → Cu2O(s) + HCOO-(aq) + 3H2O(l)

  4. N2H4(l) + 2H2O2(l) → N2(g) + 4H2O(l)

  5. Pb(s) + PbO2(s) + 2H2SO4(aq) → 2PbSO4(s) + 2H2O(l)

Describe hybridisation in the case of PCl5 and SF6. The axial bonds are longer as compared to equatorial bonds in PCl5 whereas in SF6 both axial bonds and equatorial bonds have the same bond length. Explain.
Match the following prefixes with their multiples:
 
Prefix
Multiples
(i)
micro
106
(ii)
deca
109
(iii)
mega
10-6
(iv)
giga
10-15
(v)
femto
10
How can we calculate the equivalent weight of oxidants and reductants?
  1. Define solubility product. Write solubility product expression in terms of molar solubility for FeCl3
  2. What is the effect of temperature on solubility of gases in liquids?
  3. Equilibrium constant for the reaction is 4.0. What will be the equilibrium constant for the reverse reaction.
  4. Calculate the pH of 10-8M HCl solution.
$2\text{NO}(\text{g})+\text{O}_2(\text{g})\rightleftharpoons2\text{NO}_2(\text{g});\Delta\text{H}=-17\text{KJ}$
  1. Predict the effect of an increase in concentration of NO on the equilibrium concentration of NO2.
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Whenever a reaction between an oxidising agent and a reducing agent is carried out, a compound of lower oxidation state is formed if the reducing agent is in excess and a compound of higher oxidation state is formed if the oxidising agent is in excess. Justify this statement giving three illustrations.