Ostwald dilution law for weak electrolyte HA can be given as

(1) Ka=2(1-α)
(2) Ka = 2 if α0
(3) Ka = 2λ2(λ2-λ)
(4) All of the above

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 76%
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If carbon dioxide is 2% dissociated at equilibrium 2CO2 (g)2CO(g) + O2(g). The mole fraction of CO2 at equuilibrium is

(1) 1.01/0.98            (2) 0.98/1.01

(3) 0.01/0.98            (4) 0.098/1.01

Subtopic:  Kp, Kc & Factors Affecting them |
 81%
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Which of the following is least likely to behave as Lewis base?
(1) NH3

(2) BF3

(3) OH-

(4) H2O

Subtopic:  Ionisation Constant of Acid, Base & Salt | Acids & Bases - Definitions & Classification |
 85%
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In which of the following equilibrium Kc and Kp are not equal?

(1) 2NO(g) N2(g) + O2(g)

(2) SO2(g) + NO2(g) SO3(g) + NO(g)

(3) H2(g) + I2(g) 2HI(g)

(4) 2C(s) + O2(g) 2CO2(g)

Subtopic:  Kp, Kc & Factors Affecting them |
 94%
From NCERT
NEET - 2010
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Which one of the following molecular hydrides acts as a Lewis acid?

(1) NH3         

(2) H2O         

(3) B2H6           

(4) CH4

Subtopic:  Acids & Bases - Definitions & Classification |
 85%
From NCERT
NEET - 2010
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If the concentration of OH- ions in the reaction

Fe(OH)3 (s) Fe3+ (aq) + 3OH-(aq) is decreased to 1/4 times, then equilibrium concentration of Fe3+ will increase by

(a) 8 times                            (b) 16 times

(c) 64 times                          (d) 4 times

Subtopic:  Kp, Kc & Factors Affecting them |
 84%
NEET - 2008
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Calculate the pOH of a solution at 25°C that contains 1x10-10 M of hydronium ions.

(a) 7.00                                 (b) 4.00

(c) 9.00                                 (d) 1.00

Subtopic:  pH calculation |
 83%
NEET - 2007
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At a certain temperature the following equilibrium is established, CO(g) + N02(g) CO2(g)+ NO(g)One mole of each of the four gas is mixed in one litre container and the reaction is allowed to reach equilibrium state. When excess of baryta water (Ba(OH)2) is added to the equilibrium mixture, the weight of white ppt (BaCO3) obtained is 236.4 gm. The equilibrium constant Kc of the reaction is (Ba = 137)

(1) 1.2

(2) 2.25

(3) 2.1

(4) 3.6

Subtopic:  Kp, Kc & Factors Affecting them |
 67%
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For the equilibrium:

LiCl·3NH3LiCl·NH3+2NH3·KP=9 atm2

At 27°C, a 8.2L vessel contains 0.1 mol of LiCl.NH3(s). How many moles of NH3 should be added to the flask at this temperature of derive the backward reaction for completion?

(1) 20.5 mol

(2) 3 mol

(3) 1.2 mol

(4) 0.21 mol

Subtopic:  Kp, Kc & Factors Affecting them |
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Ammonia at a pressure 10 atm and CO2 at a pressure at 20 atm are introduced into an evacuated chamber. If Kp for the reaction

NH2COONH4(s) 2NH3(g)+CO2(g) is 2020 atm2 at 400K then the final pressure in the chamber would be

(1) Less than 30 atm

(2) More than 30 atm

(3) Equal to 30 atm

(4) Unpredictable

Subtopic:  Kp, Kc & Factors Affecting them |
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