In which solution, AgCl has minimum solubility ?

1. 0.05 M AgNO₃

2. 0.01 M NaCl

3. Pure Water

4. 0.01 M NH₄OH

50 ml of HCl (pH=1) is mixed with another 100 ml of HCl (pH=2) then pH of resulting solution will be approximately

1. 1.2

2. 1.4

3. 1.6

4. 1.8

In a nitrating mixture (HNO₃ + H₂SO₄), HNO₃ acts as

1. Acid

2. Base

3. Acid as well as Base

4. Neither acid nor base

Find the dissociation constant (Kₐ) of acetic acid if the pH of the solution is 4.2 at the half-neutralisation point during its titration with NaOH.

1. 6.31 × 10^-5

2. 3.2 × 10^-5

3. 8.7 × 10^-8

4. 6.42 × 10^-4

The strongest Lewis acid among the following is:

1. BBr₃

2. BCl₃

3. BF₃

4. All are same

The solubility product constant (Ksp) of Fe(OH)₂ at 25°C is 1.6 × 10⁻¹⁴. The molar solubility of Fe(OH)₂ in a solution of pH 8 is:

1. 0.06

2. 0.016

3. 0.01

4. 0.16

To a 200 ml of 0.1 M weak acid HA solution 90 ml of 0.1 M solution of NaOH be added, Now, what volume of 0.1 M NaOH be added into above solution so that pH of resulting solution be 5.

[K_a(HA) = 10^-5]

1. 2 ml               

2. 20 ml

3. 10 ml             

4. 15 ml

If carbon dioxide is 2% dissociated at equilibrium 2CO₂ (g)$\rightleftharpoons$2CO(g) + O₂(g). The mole fraction of CO₂ at equuilibrium is

1. 1.01/0.98           

2. 0.98/1.01

3. 0.01/0.98           

4. 0.098/1.01

For N₂ + 3H₂ $\rightleftharpoons$2NH₃, one mole of N₂ and three moles of H₂ are at pressure of 4 atm. Equilibrium pressure is found to be 3 atm. Hence, K_p is

1.    1/(0.5)x(0.15)³               2. 1/(0.5)x(1.5)³

3. 3x3/(0.5)x(1.5)³                 4. none of the above

The pH of a solution obtained by mixing 100ml of 0.2 M CH₃COOH with 100ml of 0.2 M NaOH would be (given pKa for CH₃COOH = 4.74)

1. 4.74

2. 8.87

3. 9.10

4. 8.57