Question
Explain different definitions of oxidation and reduction processess with example.

Answer

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Reaction between $N _2$ and $O _2$ - takes place as follows:
$
2 N_2(g)+O_3(g) \rightleftharpoons 2 N_2 O(g)
$
If a mixture of 0.482 mol of $N _2$ and 0.933 mol of $O _2$ is placed in a 10 L reaction vessel and allowed to form $N _2 O$ at a temperature for which $K_c=2.0 \times 10^{-37}$ determines the composition of the equilibrium mixture.
Discuss the factors affecting electron gain enthalpy and the trend in its variation in the periodic table.
  1. At 473K, equilibrium constant, K for decomposition of PCl5 is 8.3 × 10-3. If decomposition is depicted as

$\text{PCl}_5(\text{s})\rightleftharpoons\text{PCl}_3(\text{s})+\text{Cl}_2(\text{g});$

$\Delta_\text{r}\text{H}^\text{o}=124.0\text{kJ mol}^{-1}$

  1. Write an expression for Kc for the reaction.
  2. What is the value of Kc for the reverse reaction at same temperature.
  3. What would be the effect on Kc if:
  1. The pressure is increased?
  2. The temperature is increased?
  1. Write equilibrium constant for the following reactions:
  1. $\text{BaCO}_3(\text{s})\rightleftharpoons\text{BaO(s)}+\text{CO}_2(\text{g})$

  2. $\text{CH}_4(\text{g})+2\text{O}_2(\text{g})\rightleftharpoons\text{CO}_2(\text{g})+2\text{H}_2\text{O(g)}$

Assign reason for the following:
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  2. ClF3 has only 90° bond angles.
  3. SO2 is angular but SO3 is planar.
  4. NH3 and PH3 have same hybridization but different bond angle.
  5. CuSO4.5H2O loses 4H2O on heating but not the fifth molecule.
All transition elements are d-block elements, but all d-block elements are not transition elements. Explain.
The solubility product constant of Ag2CrO4 and AgBr are 1.1 × 10–12 and 5.0 × 10–13 respectively. Calculate the ratio of the molarities of their saturated solutions.
How can we calculate the equivalent weight of oxidants and reductants?
Define the first law of thermodynamics and also derive its mathematical form.
If the density of methanol is 0.793kg L–1, what is its volume needed for making 2.5L of its 0.25M solution?
Kp = 0.04 atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of C2H6 when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?
$\text{C}_2\text{H}_6\text{ (g)}\rightleftharpoons\text{C}_2\text{H}_4\text{ (g) + H}_2\text{ (g)}$