Chemistry Basic Unit 4 Test

K_sp values of four salts are given, which is least soluble in water

• 10^-23

• 10^-25

• 10^-20

• 10^-21

Solubility product of a salt AB is 0.25 mol² / dm⁶, what will be its solubility (mol/dm³)

• 0.5

• 0.05

• 0.125

• 0.025

pH of buffer in which concentrations of salt and base are 0.01M and 0.1M respectively (pK_b = 4.0)

• 3.0

• 9.0

• 2.0

• 11.0

The product of the concentrations of each ion in saturated solution of a sparingly soluble salt at 298K, raised to the power their relative concentrations is

• K_sp

• K_b

• K_a

• K_w

pK_a values of four acids are given. Find the stronger one

• 0

• 3

• 9

• 1

Yield of ammonia in Haber’s process can be increased by all except

• Decreasing temperature

• Adding nitrogen

• Adding catalyst

• Increasing pressure

Following is the condition of reversible reaction that is not affected by pressure (where ∆n = number of moles of product–number of moles of reactants)

• ∆n = 0

• ∆n = 1

• ∆n = -1

• ∆n = 2

Consider a reaction 1/2N₂3/2H₂ ⇌ NH₃Correct relation between K_p and K_c is

• K_p = K_c (RT)^1/2

• K_p = K_c (RT)

• K_c = K_p (RT)

• K_p = K_c√RT

Appropriate units of Kp for the following reaction is

2SO_3(g) ⇌ 2SO_2(g)+O_2(g)

• mol/dm³

• dm³/mol

• Atm

• Atm²

At equilibrium, relationship between concentrations of reactants and products

• [Reactants] > [Products]

• [Reactants] = [Products]

• [Reactants] < [Products]

• All are possible