The low solubility of LiF and that of CsI in water are respectively due to which of the following properties of the alkali metal ions?
Higher hydration enthalpy of Li, higher lattice enthalpy of Cs+
Smaller hydration enthalpy of Li, higher lattice enthalpy of Cs+
Smaller lattice enthalpy of Li, higher hydration enthalpy of Cs+
Higher lattice enthalpy of Li, smaller hydration enthalpy of Cs+
The relative strength of trichlorides of boron group to accept a pair of electron is given by
GaCl3 > AlCl3 > BCl3
AlCl3 > BCl3 > GaCl3
AlCl3 > GaCl3 > BCl3
BCl3 > AlCl3 > GaCl3
If the ionic product of M (OH)2 is 5 × 10-10, then the molar solubility of M(OH)2 in 0.1 M NaOH is
5 × 10-12 M
5 × 10-8 M
5 × 10-10 M
5 × 10-9 M
Equilibrium constants are given for the following two equilibria.
(i) A2 (g) + B2 (g) 2AB (g); K = 2 × 10-4 L mol-1
(ii) 2AB (g) + C2 (g) 2ABC (g); K = 2 × 10-2 L mol-1
Calculate the equilibrium constant for the following equilibrium.
ABC (g) A2 (g) + B2 (g) + C2 (g)
500 mol1/2 L-1/2
500 mol1/2 L1/2
4 × 10-6 mol1/2 L1/2
200 mol1/2 L-1/2
The equilibrium constant for the equilibrium PCl5 (g) PCl3 (g) + Cl2 (g) at a particular temperature is 2 × 10-2 mol L-1. The number of moles of PCl5 that must be taken in a one litre flask at the same temperature to obtain a concentration of 0.20 mole of chlorine at equilibrium is
2.2
2.0
1.8
0.2
The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4-methoxybenzoic acid (IV) is
I < II < III < IV
II < I < IV < III
IV < I < II < III
IV < II < I < III
Choose the correct order of decreasing basic strength of the following compounds in aqueous solution
(i) C6H5NH2
(ii) C2H5NH2
(iii) NH3
(iv) (CH3)2NH
(i) > (ii) > (iii) > (iv)
(iv) > (ii) > (iii) > (i)
(ii) > (i) > (iii) > (iv)
(iv) > (iii) > (ii) > (i)
The salt of an alkali metal gives violet colour in the flame test. Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium. The salt is
K2SO4
KCl
Na2SO4
K2CO3
The values of limiting ionic conductance of H+ and HCOO- ions are respectively 347 and 53S cm2 mol-1, the dissociation constant of methanoic acid at 298 K is
2.5 × 10-4
2 × 10-5
2.5 × 10-5
1.5 × 10-4
In a closed cylinder of capacity 24.6 L, the following reaction occurs at 27°C.
A2 (s) B2 (s) + 2C (g)
At equilibrium, 1 gm of B2 (s) (molar mass = 50 g mol-1) is present. The equilibrium constant Kp for the equilibrium in atm2 unit is
(R = 0.082 L atm K-1 mol-1)
1.6 × 10-2
1.6 × 10-5
1.6 × 10-3
1.6 × 10-4
C.
1.6 × 10-3
Equilibrium concentration of B2,
[B2]equilibrium =
=
= 8.13 × 10-4
For the reaction,
[C] = 2 × 8.13 × 10-4 = 1.63 × 10-3
Kc = [C]2 = [1.63 × 10-3]2 = 2.66 × 10-6
Again from, Kp = Kc (RT
Here, = 2 - 0 = 2
Kp = 2.66 × 10-6 × (0.082 × 300)2
≈ 1.6 × 10-3