Chemistry Test ...

Consider the following reaction:

N₂O₄(g) ⇋ 2NO₂(g); ΔH⁰ = +58 kJ

For each of the following cases (a, b), the direction in which the equilibrium shifts is:

(a) Temperature is decreased.

(b) Pressure is increased by adding N₂ at constant T.

For the reaction

Fe₂N(s) + 3/2 H₂(g) ⇋ 2Fe(s) + NH₃(g),

The first and second dissociation constants of an acid H₂A are 1.0 × 10^-5 and 5.0 × 10^-10 respectively.

The overall dissociation constant of the acid will be:

What volume of 0.2 M NH₄Cl solution should be added to 100 ml of 0.1 M NH₄OH solution to produce a buffer solution of pH = 8.7 ?

Given : pK_b of NH₄OH = 4.7 ; log 2 = 0.3

How many gm of solid NaOH must be added to 100 ml of a buffer solution which is 0.1 M each w.r.t. Acid HA and salt Na⁺ A^- to make the pH of solution 5.5. Given pK_a(HA) = 5 (Use antilog (0.5)= 3.16)

100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured.

Which of the following graphs correctly depicts the change in pH?

How many litres of water must be added to 1 litre of an aqueous solution of HCl with pH = 1 to create an aqueous solution with pH = 2?

Which one of the following solutions has the maximum pH value?

The pH of 0.1 M NH₄OH (K_b = 1.8 × 10^–5 M) at 25°C is