A weak base BOH with Kb =10-5 is titrated with a strong acid HCl. At 34th of the equivalence point pH of solution is

(1) 5+log3

(2) 5-log3

(3) 9.425

(4) 8.523

Subtopic:  pH calculation |
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A 0.1 molar solution of weak base BOH is 1% dissociated. If 0.2 moles of BCl is added in 1 litre solution of BOH, the degree of dissociation of BOH will become

(1) 2×10-3

(2) 5×10-5

(3) 0.05

(4) 0.02

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 57%
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Assuming no change in volume, calculate the minimum mass of NaCl (approx.) necessary to dissolve 0.01 mol AgCl in 100 L solution.

[Given Ksp(AgCl)=10-10; Kf(AgCl2-)=3×105]

1. 15 kg

2. 21 kg

3 10 kg

4 .17 kg

Subtopic:  Solubility Product |
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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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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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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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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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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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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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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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