Which of the following pairs constitutes a buffer?          

(a) HNO2 and NaNO2           (b) NaOH and NaCl

(c) HNO3 and NH4NO3         (d) HCl and KCl

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In which of the following equilibrium Kc and Kp are not equal ?

[2010]

(a) 2NO(g)        N2(g) + O2(g)

(b) SO2(g) + NO2(g)        SO3(g) + NOg

(c) H2(g) + I2(g)       2HI(g)

(d) 2C(s) + O2(g)        2CO2(g)

Concept Questions :-

KP/KC - Factors
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If K1 and K2 are equilibrium constants for reactions (I) and (II) respectively for,

N2 + O2 2NO           .....(i)

12N212O2  NO     .....(ii)

Then:

(a) K2 =K1                     (b) K2 =K1

(c) K1 =2K2                    (d) K112K2

Concept Questions :-

KP/KC - Factors
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According to Le-Chatelier's principle, adding heat to a solid liquid equilibrium will cause the    

(a) temperature to increase

(b) temperature to decrease

(c) amount of liquid to decrease

(d) amount of solid to decrease

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Le Chatelier
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Ostwald's solution dilution law is applicable in the case of the solution of:

(a) CH3COOH                                     (b) NaCl

(c) NaOH                                            (d) H2SO4

Concept Questions :-

Introduction To Equilibrium
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At 25°C, the dissociation constant of a base, BOH is 1.0 x 10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be                                     

(a) 2.0 x 10-6 mol L-1              (b) 1.0 x 10-5 mol L-1 

(c) 1.0 x10-6 mol  L-1              ( d) 1.0 x10-7 mol L-1 

Concept Questions :-

KP/KC - Factors
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The pKa of acetyl salicylic acid (aspirine) is 3.5. The pH of gastric juice in human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirine will be:

(a) unionized in the small intestine and in the stomach

(b) completely ionised in the small intestine and in the stomach

(c) ionized in the stomach and almost unionized in the small intestine

(d) ionized in the small intestine and almost unionized in the stomach

Concept Questions :-

KP/KC - Factors
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What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH?

(Ka for CH3COOH = 1.8 x 10-5)       

(a) 3.5x10-4             (b) 1.1x10-5

(c) 1.8x10-5             (d) 9.0x10-6

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The hydolysis of the salt of strong acid and weak base is called:

(a) anionic hydrolysis

(b) cationic hydrolysis

(c) amphoteric hydrolysis

(d) none of the above

Concept Questions :-

Salt Hydrolysis
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For the reaction, A+B3C at 25° C, a 3 litre vessel contains 1,2, 4 mole of A, B and C respectively. If Kc for the reaction is 10, the reaction will proceed in:

(a) forward direction                             (b) backward direction

(c) in either direction                            (d) in equilibrium

Concept Questions :-

Introduction To Equilibrium
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