Question
Write short note on ionisation constant and ionic product of water.

Answer

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Discuss and compare the trend in ionisation enthalpy of the elements of group1 with those of group17 elements.
At 1127K and 1 atm pressure, a gaseous mixture of CO and CO2 in equilibrium with soild carbon has 90.55% CO by mass
$\text{C (S) + CO}_2\text{ (g)}\rightleftharpoons2\text{CO (g)}$
Calculate Kc for this reaction at the above temperature.
Give a brief description of the principles of the following techniques taking an example in each case.
Chromatography.
Write the expression for the equilibrium constant, $K _{ C }$ for each of the following reactions:
a. $2 NOCl ( g ) \rightleftharpoons 2 NO ( g )+ Cl _2(g)$
b. $2 Cu \left( NO _3\right)_2(s) \rightleftharpoons 2 CuO ( s )+4 NO _2(g)+ O _2(g)$
c. $CH _3 COOC _2 H _5( aq )+ H _2 O ( l ) \rightleftharpoons CH _3 COOH ( aq )+ C _2 H _5 OH ( aq )$
d. $Fe ^{3+}( aq )+3 OH ^{-}( aq ) \rightleftharpoons Fe ( OH )_3(s)$
e. $I _2(s)+5 F_2 \rightleftharpoons 2 IF _5$
What is distillation? Explain different types of distillation.
How much volume of 0.1M CH2COOH should be added to 50mL of 0.2M CH3COONa solution to prepare a buffer solution of pH 4.91. (pKa of ACH is 4.76).
Classify the following substances into oxidising and reducing agents:
  1. Carbon.
  2. Ozone.
  3. Nascent hydrogen.
  4. Nitric acid.
  5. Chlorine.
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)

Explain redox reactions on the basis of electron transfer. Give suitable examples.
Consider the following species:
N3–, O2–, F, Na+, Mg2+ and Al3+
  1. What is common in them?
  2. Arrange them in the order of increasing ionic radii.