Multiple Choice QuestionsFour species are listed below
i. HCO3−
ii. H3O+
iii. HSO4−
iv. HSO3F
Which one of the following is the correct sequence of their acid strength?
iv < ii < iii < i
ii < iii < i < iv
i < iii < ii < iv
i < iii < ii < iv
The pKa of a weak acid, HA, is 4.80. The pKb of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be
9.58
4.79
7.01
7.01
The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is
4.5
2.5
9.5
9.5
Regular use of which of the following fertilizers increases the acidity of soil ?
Potassium nitrate
Urea
Superphosphate of lime
Superphosphate of lime
D.
Superphosphate of lime
(NH4)2 SO4 is a salt of the strong acid and weak base, on hydrolysis it ill produce H+ ion. This will increase the acidity of the soil.
An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct?
(Tf)irrev > (Tf)rev
Tf > Ti for reversible process but Tf = Ti for irreversible process
(Tf)rev = (Tf)irrev
(Tf)rev = (Tf)irrev
The equilibrium constant for the reaction
is Kc = 4.9 × 10–2. The value of Kc for the reaction'
2SO2 (g) +O2(g) ⇌ 2SO3 (g) will be
416
2.40 × 10–3
9.8 × 10–2
9.8 × 10–2
For a spontaneous reaction the ∆G, equilibrium constant (K) and Eocell will be respectively
-ve, >1, +ve
+ve, >1, -ve
-ve, <1, -ve
-ve, <1, -ve
The exothermic formation of ClF3 is represented by the equation
Which of the following will increase the quantity of ClF3 in an equilibrium mixture of Cl2, F2 and ClF3?
Increasing the temperature
Removing Cl2
Increasing the volume of the container
Increasing the volume of the container
For the reaction
When Kp and Kc are compared at 184oC, it is found that
Kp is greater than Kc
Kp is less than Kc
Kp = Kc
Kp = Kc
Hydrogen ion concentration in mol / L in a solution of pH = 5.4 will be
3.98 x 108
3.88 x 106
3.68 x 10-6
3.68 x 10-6
Switch
