21881.20 ml of 0.1 M acetic acid is mixed with 50 ml of Potassium acetate. Kα of acetic acid = 1.8 × 10–5 at 27°C. The concentration of Potassium acetate if pH of the mixture is 4.8 is
0.1 M
0.04 M
0.4 M
0.02 M
21882.Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the total pressure exerted by oxygen is
2/3
1/3 × 273/298
1/3
1/2
21883.Dialysis can be used to separate
glucose and fructose
protein and starch
glucose and protein
glucose and NaCl
21884.What is the molality of a solution containing 200 mg of urea (molar mass 60 g mol–1) dissolved in 40 g of water ?
0.0825
0.825
0.498
0.0013
21885.Molality of an aqueous solution that produces an elevation of boiling point of 1.00 K at 1 atm pressure is (Kb for water = 0.512 K Kg mol–1)
0.512 M
0.915 M
1.95 M
5.12 M
21886.Solubility of which among the following substances in water increases slightly with rise in temperature?
Potassium bromide
Potassium chloride
Potassium nitrate
Sodium nitrate
21887.To observe an elevation of boiling point of 0.05°C, the amount of solute (Mol. Wt. = 100) to be added to 100 g of water (Kb = 0.5) is
2 g
0.5 g
1 g
0.75 g
21888.The volume of ethyl alcohol (density 1.15 g/cc) that has to be added to prepare 100 cc of 0.5 M ethyl alcohol solution in water is
1.15 cc
2 cc
2.15 cc
2.30 cc
21889.50 cm3 of 0.2 N HCl is titrated against 0.1 N NaOH solution. The titration is discontinued after adding 50 cm3 of NaOH. The remaining titration is completed by adding 0.5 N KOH. The volume of KOH required for completing the titration is ______.
10 cm3
12 cm3
10.5 cm3
25 cm3
21890.250 ml of a solution contains 6.3 grams of oxalic acid (mol. wt. = 126). What is the volume (in litres) of water to be added to this solution to make it a 0.1 N solution?
750
7.5
0.075
0.75