Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
2.28 mol kg-1
3.28 mol kg-1
0.44 mol kg-1
1.14 mol kg-1
The pKa value of (I) 2 - bromo propanoic acid, (II) 2-fluoro propanoic acid, (III) 3 - fluoro propanoic acid, (IV) 3- bromo propanoic acid decreases as
I > III > IV > II
II > IV > III > I
I > IV > III > II
IV > I > III > II
The correct order of electron affinity of oxygen, sulphur, chlorine, fluorine is
S < O < Cl < F
S < O < F < Cl
O < S < F < Cl
O < S < Cl < F
The metal which deposits copper from copper sulphate solution is
gold
iron
platinum
mercury
B.
iron
Iron being more reactive than copper displaces, copper from copper sulphate solution.
CuSO4 + Fe → FeSO4 + Cu ↓
Au (gold), Pt (platinum) and Hg (mercury) are less reactive as compared to copper, thus they cannot be displaced from its salt solution.
Favourable conditions for the formation of electrovalent bond is that the cation and anion must have, respectively
high ionisation potential and low electron affinity
low ionisation potential and high electron affinity
high ionisation potential and high electron affinity
low ionisation potential and low electron affinity
Consider the following reaction,
(CH3)3CCl + OH- → (CH3)3C-OH + Cl-
If OH- does not take part in slow step, the molecularity and order of the reaction are respectively,
2, 2
2, 1
1, 2
1, 1
Given, H2O (l) → H2O (g); H1 = +43 kJ
H2O (s) → H2O (l); H2 = +6.05 kJ. Calculate the enthalpy of sublimation of ice.
49.75 kJ mol-1
37.65 kJ mol-1
43.7 kJ mol-1
55.23 kJ mol-1
Which of the following pairs will show common ion effect?
Barium chloride + Barium sulphate
Silver cyanide + Potassium nitrite
Ammonium hydroxide + Ammonium chloride
Sodium chloride + Hydrogen chloride