If in the reaction N2O4 ⇌ 2NO2 , x is that part o

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 Multiple Choice QuestionsMultiple Choice Questions

541.

H3PO3 is

  • dibasic acid

  • basic

  • tribasic acid

  • neutral


542.

In an exothermic equilibrium ,

A + 3B  AB3

all the reactants and products are in gaseous state. The formation of AB3 is favoured at :

  • low temperature and low pressure

  • low temperature and high pressure

  • high temperature and high pressure

  • high temperature and low pressure


543.

A precipitate of AgCl is formed when equal volumes of the following are mixed :

[Ksp for AgCl = 10-10]

  • 10-4 M AgNO3 and 10-7 M HCl

  • 10-5 M AgNO3 and 10-6 M HCl

  • 10-5 M AgNO3 and 10-4 M HCl

  • 10-6 M AgNO3 and 10-6 M HCl


544.

The species among the following, which can act as an acid and a base is :

  • HSO42-

  • SO42-

  • H3O+

  • Cl-


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545.

If in the reaction N2O4  2NO2 , x is that part of N2O4 which dissociates, then the number of molecules at equilibrium will be :

  • 1

  • 3

  • (1 + X)

  • (1 + X)2


C.

(1 + X)

N2O4  2NO2

1             0       before dissociation

1-x          2x     after dissociation

Total number of moles at equilibrium
= 1 - X + 2x = 1 + X


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546.

For the reaction, H2 + I2 2HI, K = 47.6. If the initial number of moles of each reactant and product is 1 mole then at equilibrium

  • [I2] = [H2] , [I2] > [HI]

  • [I2] = [H2] , [I2] < [HI]

  • [I2] < [H2] , [I2] = [HI]

  • [I2] > [H2] , [I2] = [HI]


547.

Calculate the overall complex dissociation equilibrium constant for the [Cu(NH3)4]2+ ions, given that stability  constant (β4) for this complex is 2.1 × 1013.

  • 8.27 × 10-13

  • 4.76 × 10-14

  • 2.39 × 10-7

  • 1.83 × 1014


548.

The temperature dependence of a reaction is represented by the Arrhenius equation: 

ln k = -EaRT+ln A

Which among the following is wrong conclusion about the given plot?

  • Intercept of the line= ln A

  • Slope = -EaRT

  • Reaction with high activation energy is more temperature sensitive than that of low activation energy (Ea).

  • Slope = - EaR


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549.

Which of the following oxoacids of phosphorus is a reducing agent and a monobasic acid as well?

  • H4P2O5

  • HPO3

  • H3PO3

  • H3PO2


550.

Ka for HCN is 5 x 10-10 at 25°C. For maintaining a constant pH = 9, the volume of 5 M KCN solution required to be added to 10 mL of 2 M HCN solution is

  • 4 mL

  • 2.5 mL

  • 2 mL

  • 6.4 mL


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