Calculate the concentration of OH^- ions in solution when [H⁺] = 6.2 x 10^-2molL^-1.

22.

State the Le-Chatelier’s principle.

For a crystal of sodium chloride, state: 
(i) The type of lattice in which it crystallises.
(ii) The coordination number of each sodium ion and chloride ion in the crystal lattice.
(iii) The number of sodium ions and chloride ions present in a unit cell of sodium chloride.
(iv) The structural arrangement of the sodium chloride crystal.

Consider the following reaction:
N₂O₄(g) + Heat ⇌ 2NO₂(g)
How is the composition of equilibrium mixture affected by:

(i) a change in temperature
(ii) a change in pressure
(iii) a change in concentration of N₂O₄
(iv) the removal of NO₂ from the reaction mixture

The specific conductance of a 0.01 M solution of acetic acid at 298 K is 1.65 x 10^-4 ohm^-1 cm^-1.The molar conductance at infinite dilution for H⁺ ion and CH3COO ^– ion are 349.1 ohm^-1 cm²mol^-1 and 40.9 ohm^-1 cm²mol^-1 respectively.
Calculate:

(i) Molar conductance of the solution.
(ii) Degree of dissociation of CH₃COOH.
(iii) Dissociation constant for acetic acid.

(i) Calculate the e.m.f. of the following cell reaction at 298 K:

Mg (s) + Cu²⁺ (0.0001 M) → Mg²⁺ (0.001M) + Cu (s)

The standard potential (E⁰) of the cell is 2.71 V.


(ii) The solubility product (Ksp) of BaSO4 is 1.5 x 10-9.Calculate the solubility of barium sulphate in pure water and in 0.1 M BaCl₂.

Explain the following :
(i) When NH₄ Cl and NH₄OH are added to a solution containing both, Fe³⁺ and Ca²⁺
ions, which ion is precipitated first and why?

(ii) Dissociation of H₂S is suppressed in acidic medium.

Write the IUPAC names of the following coordination compounds: 
(i) [Cr(NH₃)₄(H₂O)₂]Cl₃
(ii) [PtCl₂(NH₃)₄] [PtCl₄]

State the hybridization and magnetic property of [Fe(CN)₆]^3- ion according to the valence bond theory.

(i) What type of isomers are [Co(NH₃)₅Br]SO₄ and [Co(NH₃)₅SO₄]Br.? Give a chemical test to distinguish between them.

(ii) Write the structures of optical isomers of the complex ion [Co(en)₂Cl₂]⁺