For NH4HS(s) NH3 (g) + H2S(g), the observed pressure for reaction mixture in equilibrium is 1.12 atm at 106°C. The value of Kp for the reaction is:

(1) 3.136 atm                          

(2) 0.3136 atm2

(3) 31.36 atm2                           

(4) 6.98 atm2

Subtopic:  Kp, Kc & Factors Affecting them |
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The relation for calculating pH of a solution containing weak acid and its salt is:

(1) pH = pKa + log[Conjugate Base][Acid]

(2) pH = pKa - log[Conjugate Base][Acid]

(3) pH = pKa + log[Conjugate Base][Salt]

(4) pOH = pKa - log[Acid][Conjugate Base]

Subtopic:  Introduction To Equilibrium |
 73%
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Solubility of a gas in liquid increases on:

(1) addition of a catalyst

(2) increasing the pressure

(3) decreasing the pressure

(4) increasing the temperature

Subtopic:  Le Chatelier's principle |
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Which of these is least likely to act as a Lewis base?             

(1) CO         

(2) F-           

(3) BF3         

(4) PF3

Subtopic:  Acids & Bases - Definitions & Classification |
 73%
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The ionisation constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium chloride is

(a) 5.65 x 10-10                      (b) 6.50 x 10-12

(c) 5.65 x 10-13                      (d) 5.65 x 10-12

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 69%
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For a given solution pH = 6.9 at 60°C, where Kw=10-12. The solution is:

(1) acidic                                           

(2) basic

(3) neutral                                         

(4) unpredictable

Subtopic:  pH calculation |
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The stronger Bronsted based is:

(a) ClO-                (b) ClO2-   

(c) ClO3-               (d)  ClO4- 

Subtopic:  Acids & Bases - Definitions & Classification |
 65%
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The equilibrium, 2SO2 (g) + O2 (g2SO3 (g)

shifts forward if:

(1) a catalyst is used

(2) an absorbent is used to remove SO3 as soon as it is formed

(3) small amounts of reactants are used

(4) none of the above

Subtopic:  Le Chatelier's principle |
 80%
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The pH of blood is maintained by CO2 by and H2CO3 in the body and chemical constituents of blood. This phenomenon is called:

(a) colloidal                            (b) buffer action

(c) acidic                                (d) salt balance

Subtopic:  Buffer |
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At temperature T, a compound AB2 (g) dissociates according to the reaction 2AB22AB(g) +B2(g) with a degree of dissociation x, which is small compared with unity. The expression for Kp, in terms of x and the total pressure P , is:

(1) Px3/2

(2) Px2/3

(3) Px3/3

(4) Px2/2

Subtopic:  Kp, Kc & Factors Affecting them |
 63%
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