The equilibrium constants and for the reactions X2Y and Z P + Q respectively are in the ratio of 1:9. If the degree of dissociation ox X and Z be equal then the ratio of total pressure at these equilibria is:
1. 1:9
2. 1:36
3. 1:1
4. 1:3
The formation of phosgene is represented as,
CO + Cl2 COCl2
The reaction is carried out in 500 mL flask. At equilibrium o.3 mole of phosgene, 0.1 mole of CO and 0.1 mole of Cl2 are present. The equilibrium constant of the reaction is:
1. 30
2. 15
3. 5
4. 3
Equimolar solutions of the following substances were prepared separetly. Which one of these will record the highest pH value?
1. BaCl2
2. AlCl3
3. LiCl
4. BeCl2
If the pressure of N2 and H2 mixture in a closed apparatus is 100 atm and 20% of the mixture then reacts, the pressure at the same temperature would be:
1. 100
2. 90
3. 85
4. 80
Which salt undergoes hydrolysis?
1. CH3COONa
2. KNO3
3. NaCl
4. K2SO4
If K1 and K2 are the respective equilibrium constants for the two reactions,
XeF6(g) + H2O(g) XeOF4(g) + 2HF(g)
XeO4(g) + XeF6(g) XeOF4(g) + XeO3F2 (g)
The equilibrium constant for the reaction,
XeO4(g) + 2HF(g) XeO3F2(g) + H2O(g) is:
1. K1K2
2. K1/
3. K2/K1
4. K1/K2
The conjugate base of [Al(H2O)3(OH)3] is:
1. [Al(H2O)3(OH)2]+
2. [Al(H2O)3(OH)2O]-
3. [Al(H2O)3(OH)3]-
4. [Al(H2O)2(OH)4]-
2 mole of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium 40% of PCl5 dissociated into PCl3 and Cl2. The value of the equilibrium constant is :
1. 0.267
2. 0.53
3. 2.63
4. 5.3
Solubility of MX2 type electrolytes is 0.5x10-4 mol/L, then the Ksp of electrolytes is :
1. 5 x 10-12
2. 25 x 10-10
3. 1 x 10-13
4. 5 x 10-13
One mole of ethyl alcohol was treated with one mole of acetic acid at 25C. 2/3 of the acid changes into ester at equilibrium. The equilibrium constant for the reaction will be:
1. 1
2. 2
3. 3
4. 4
For a given solution pH = 6.9 at 60C, where Kw=10-12. The solution is:
1. acidic
2. basic
3. neutral
4. unpredictable
For the reaction equilibrium,
2NOBr(g) 2NO(g) + Br2, if = P/9 at equilibrium and P is total pressure. The ratio of Kp/P is equal to:
1. 1/9
2. 1/81
3. 1/27
4. 1/3
At a certain temperature, 2HI H2 +I2 only 50% HI is dissociated at equilibrium. The equilibrium constant is:
1. 1.0
2. 3.0
3. 0.5
4. 0.25
40% of a racemic mixture of 0.2 moles of N2 and 0.6 moles of H2 react to give NH3 according to the equation, N2 (g) + H2(g)2NH3 (g) at constant temperature and pressure. Then the ratio of the final volume to the initial volume of gases is:
1. 4:5
2. 5:4
3. 7:10
4. 8:5
pH of a saturated solution of Ba(OH)2 is 12. The value of solubility product Ksp of Ba(OH)2 is
1. 3.3 x 10-7
2. 5.0 x 10-7
3. 4.0 x 10-6
4. 5.0 x 10-6
28 g N2 and 6g H2 were mixed. At equilibrium 17 g NH3 was formed. the mass of N2 and H2 of equilibrium are respectively:
1. 11 g, zero
2. 1 g, 3 g
3. 14 g, 3 g
4. 11 g, 3 g
The Ksp of Ag2CrO4, AgCl, AgBr and Agl are, respectively, 1.1x10-12, 1.8x10-10, 5.0x10-13, and 8.3x10-17. The salt precipitates that last if the AgNO3 solution is added to the solution containing equal moles of NaCl, NaBr, Nal and Na2CrO4 is -
1. | Agl | 2. | AgCl |
3. | AgBr | 4. | Ag2CrO4 |
For the chemical equilibrium, CaCO3(s) CaO(s) + CO2 (g) ΔHf° can be determined from which one of the following plots ?
(1)
(2)
(3)
(4)
Equilibrium constant for the given reaction is kc = 1020 at temperature 300 K,A(s) + 2B (aq.) 2C (s) + D (aq.)K = 1020 The equilibrium conc. of B starting with mixture of 1 mole of A and 1/3 mole/litre of B at 300 K is
(1)
(2)
(3)
(4)
Ionisation constant of HA (weak acid) and BOH (weak base) are 3.0 x 10–7 each at 298K. The percent degree of hydrolysis of BA at the dilution of 10L is :
1. 25
2. 50
3. 75
4. 40
A certain mixture of HCl and CH3 – COOH is 0.1 M in each of the acids. 20 ml of this solution is titrated against 0.1M NaOH. By how many units does the pH change from the start to the stage when the HCl is almost completely neutralised? Ka for acetic acid = 1.8 x 10–6.
(1) 2.03
(2) 0.775
(3) 2.325
(4) 3.172
In the reaction COCl2(g) CO(g) + CI2(g) at 550° ,
,when the initial pressure of CO & Cl2 are 250 and 280 mm of Hg respectively. The equilibrium pressure is found to be 380 mm of Hg. Calculate the degree of dissociation of COCl2 at 1 atm. What will be the extent of dissociation, when N2 at a pressure of 0.4 atm is present and the total pressure is 1 atm.
(1) 0.32 and no change
(2) 0.32 and 0.4
(3) 0.4 and 0.3
(4) at the pressure,N2 dissociation cannot take place
What is the value of pKb (CH3COOH–) if = 390 & = 7.8 for 0.04 of a CH3COOH at 25°C
(a) 9.3
(b) 9.2
(c) 4.7
(d) 4.8
The most suitable method of separation of 1:1 mixture of ortho and para-nitrophenols is
1. sublimation
2. chromatography
3. crystallisation
4. steam distillation
Which is Lewis base?
1. HCl
2. HNO3
3. HF
4. NH3