21836.Which of the following liquid pairs shows a positive deviation from Raoult's law?
Water – hydrochloric acid
Benzene – methanol
Water – nitric acid
Acetone – chloroform
21837.Density of a 2.05 M solution of acetic acid in water is 1.20 g/mL. The molarity of the solution is
3.28 mol kg–1
2.28 mol kg–1
0.44 mol kg–1
2.14 mol kg–1
21838.The vapour pressure of two liquids P and Q are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mol of P and 2 mol of Q would be
72 torr
140 torr
68 torr
20 torr
21839.Acidified KMnO4 oxidizes oxalic acid to CO2. What is the volume (in litres) of 10–4m KMnO4 required to completely oxidize 0.5 litres of 10–2 M oxalic acid in acid medium
125
1250
200
20
21840.A binary liquid solution is prepared by mixing n–heptane and ethanol. Which one of the following statements is correct regarding the behavior of the solution?
The solution is non–ideal, showing +ve deviation from Raoult's Law
The solution is non–ideal, showing –ve deviation from Raoult's Law
n–heptane shows +ve deviation while ethanol shows –ve deviation from Raoult's Law
The solution formed is an ideal solution
21842.A 5.2 molal aqueous solution of methyl alcohol, CH3OH is supplied. What is the mole fraction of methyl alcohol in the solution?
0.050
0.100
0.190
0.086
21843.A solution containing 10 g per dm3 of urea (molecular mass = 60) is isotonic with a 5% solution of a non–volatile solute. The molecular mass of this non–volatile solute is
300 g mol–1
350 g mol–1
200 g mol–1
250 g mol–1
21844.The vapour pressure of pure water at 20°C is 17.5 mm Hg. If 18 g of glucose (C6H12O6) is added to 178.2 g of water at 20°C,the vapour pressure of resulting solution will be
17.325 m Hg
17.675 mm Hg
15.750 mm Hg
16.500 mm Hg
21845.0.004 M Na2SO4 is isotonic with 0.01 M Glucose. Degree of dissociation of Na2SO4 is
75%
50%
25%
85%
21846.If α is the degree of dissociation of Na2SO4,the Van't Hoff factor (i) used for calculating the molecular mass is
1 – α
1 + α
1 – 2α
1 + 2α
21847.In an oxidation reduction reaction, dichromate (Cr2O–2
7) ion is reduced to Cr+3 ion. The equivalent weight of K2Cr2O7 in this reaction is
7) ion is reduced to Cr+3 ion. The equivalent weight of K2Cr2O7 in this reaction is
Molecular weight/3
Molecular weight/6
Molecular weight/1
Molecular weight/2
21848.In the redox reaction,
2KMnO4 + 3H2SO4 + 5H2C2O4 → K2SO4 + 2MnSO4 + 8H2O + 10CO2
The volume of 0.1 M KMnO4 required to Oxidize 25 mL of 0.25 M H2C2O4solution is
25 L
125 mL
25 mL
1.25 L
21849.138 grams of ethyl alcohol is mixed with 72 grams of water. The ratio of mole fraction of alcohol to water is
1:4
1:2
3:4
1:1
21850.'x' grams of water is mixed in 69 grams of ethanol. Mole fraction of ethanol in the resultant solution is 0.6. What is the value of 'x' in grams?
54
36
180
18
21851.In an oxidation reduction reaction, MnO4 ion is converted to Mn2+. What is the number of equivalents of KMnO4 (mol. wt = 158) present in 250 ml of 0.04 M KMnO4 solution?
0.02
0.05
0.04
0.07
21852.What is the volume (in ml) of 0.1 M potassium permanganate solution required tocompletely oxidize 100 ml of 0.5M ferrous sulphate solution in acidic medium?
20
200
50
100
21853.35.4 ml of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is
0.194 N
0.142 N
0.97 N
0.244 N
21854.The volume of two HCl solutions A(0.5 N) and B(0.1 N) to be mixed for preparing 2l of 0.2 N HCl solution
0.5 l of A + 1.5 l of B
1.5 l of A + 0.5l of B
1 l of A + 1 l of B
0.75 l of A + 1.25 l of B
21855.X is dissolved in water. Maximum boiling point is observed when X is _______ (0.1 M each):
CaSO4
BaCl2
NaCl
urea