The equilibrium constant for the reaction,12H2(g)+12I2(g)⇌H

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 Multiple Choice QuestionsMultiple Choice Questions

571.

One mole of SO3 was placed in a vessel of 1 L capacity at a certain temperature and the following equilibrium was established.

2SO3 (g)  2SO2 (g) + O2 (g)

If 0.6 moles of SO2 were formed at equilibrium, Kc for the reaction will be

  • 0.036

  • 0.45

  • 0.54

  • 0.675


572.

Amines behave as :

  • Lewis acid

  • Lewis base

  • aprotic acid

  • neutral compound


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573.

The equilibrium constant for the reaction,

12H2(g)+12I2(g)HI(g) is Kc

Equilibrium constant for the reaction 2HI(g) H2(g) + I2(g)  will be

  • 1/Kc

  • 1/(Kc)2

  • 2/Kc

  • 2/(Kc)2


B.

1/(Kc)2

The given reaction is,

12H2(g) +12I2(g) HI(g)          ...(i)

Hence, KC=[HI][H2]1/2[I2]1/2    ...(ii)

Now, reverse the equaion (i) and multiple by 2, we get

2HI H2(g)+I2(g)

      Hence, KC'=[H2] [I2][HI]2                    

 Equating equations (ii) and (iii), we get

             KC'=1(KC)2


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574.

50 mL of 0.1 M HCl and 50 mL of 0.2 M NaOH are mixed .The pH of the resulting solution is :

  • 1.30

  • 4.2

  • 12.70

  • 11.70


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575.

Assertion : Mixture of CH3COOH and CH3COONH4 is an example of acidic buffer.

Reason: Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both aaertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


576.

Conjugate acid of CH3NH2 is :

  • CH3OH

  • CH3NH3+

  • CH2NH2+

  • CH3N-H


577.

Which one of the following aqueous solutions of salts has the lowest pH value ?

  • CH3COONa

  • NaCl

  • NH4OOCCH3

  • NH4Cl


578.

At equilibrium which is correct?

  • G = 0

  • S = 0

  • H = 0

  •  G°= 0


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579.

If the solubility of PbCl2 at 25°C is 6.3 x 10-2 mol/L , its solubility product is :

  • 1 x 10-6

  • 1 x 10-3

  • 1.1 x 10-6

  • 1.1 x 10-5


580.

Which of the following is most basic?

  • Al(OH)3

  • Cr(OH)3

  • La(OH)3

  • Fe(OH)3


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