# For the reaction, N2 + 3H2 $⇌$2NH3 in a vessel, after the addition of an equal number of mole of N2 and H2, the equilibrium state is formed. Which of the following is correct? 1. [H2] = [N2]                                2. [H2] < [N2]      3. [H2] > [N2]                                  4. [H2] > [NH3]

Subtopic:  Introduction To Equilibrium |
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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]-

Subtopic:  Acids & Bases - Definitions & Classification |
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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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Which oxide of nitrogen is the most stable?

1. 2NO2(g) $⇌$N2(g) + 2O2(g);         K=6.7x1016 mol litre-1

2. 2NO(g) $⇌$N2(g) + O2(g);            K=2.2x1030 mol litre-1

3. 2N2O5(g) $⇌$2N2(g) + 5O2(g);      K=1.2x1034 mol-5 litre-5

4. 2N2O(g) $⇌$2N2(g) + O2(g);         K=3.5x1033 mol litre-1

Subtopic:  Le Chatelier's principle |
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On adding A to the reaction at equilibrium,  AB(s) $⇌$ A(g) + B(g), the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

1. 1/2 of its original value

2. 1/4 of it s original value

3. 1/8 of its original value

4. twice of its original value

Subtopic:  Introduction To Equilibrium |
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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

Subtopic:  Kp, Kc & Factors Affecting them |
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Given, HF + H2O$\stackrel{{K}_{\mathit{a}}}{\to }$H3O+ + F-

F- + H2$\stackrel{{K}_{b}}{\to }$HF + OH-

which relation is correct?

1. Kb =Kw

2. Kb =1/Kw

3. Ka x Kb =Kw

4.  Ka/Kb = Kw

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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The value sf Kp1 and Kp2 for the reactions

X$⇌$Y+Z                                          ....(1)

and      A$⇌$2B                                          ......(2)

are in the ratio 9:1. If the degree of dissociation of X and A be equal, then total pressure at equilibrium (1) and (2) are in the ratio:

1. 1:9

2. 36:1

3. 1:1

4. 3:1

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

2. pH = pKa - log

3. pH = pKa + log

4. pOH = pKa - log

Subtopic:  Introduction To Equilibrium |
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The equilibrium constants for the reaction,

A2 $⇌$2A at 500 K and 700 K are 1x10-10 and 1x10-5. The given reaction is

(a) exothermic                    (b) slow

(c) endothermic                  (d) fast

1. a,b

2.c,b

3.a,d

4 c,d

Subtopic:  Introduction To Equilibrium |
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