If Z is a compressibility factor, Vander Waal s equation at low

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The correct set of four quantum numbers for the valence electrons fo rubidium atom (Z = 37) is

  • 5,0,0, +1/2

  • 5,1,0,6+1/2

  • 5,1,1,+1/2

  • 5,1,1,+1/2

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2.

If Z is a compressibility factor, Vander Waal's equation at low pressure can be written as 

  • straight Z space equals 1 plus RT over pb
  • straight Z space equals space 1 minus straight a over VRT
  • straight Z space equals space 1 minus pb over RT
  • straight Z space equals space 1 minus pb over RT


B.

straight Z space equals space 1 minus straight a over VRT

According to Vander Waal's equation

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3.

For the complete combustion of ethanol, C2H5OH (l) + 3O2 (g) → 2CO2 (g) + 3H2(l), the amount of heat produced as measured in a bomb calorimeter, is 1364.47 kJ mol-1 at 25oC. Assuming ideality the enthalpy of combustion, CH, for the reaction will be (R = 8.314 JK-1 mol-1)

  • -1366.95 kJ mol-1

  • -1361.95 kJ mol-1

  • -1460.50 kJ mol-1

  • -1460.50 kJ mol-1

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4.

For the reaction,

SO subscript 2 space left parenthesis straight g right parenthesis space plus space 1 half space straight O subscript 2 space left parenthesis straight g right parenthesis space leftwards harpoon over rightwards harpoon space SO subscript 3 space left parenthesis straight g right parenthesis
if Kp = Kc (RT)x where the symbol has usual meaning then the value of x is (assuming ideality)

  • -1

  • -1/2

  • 1/2

  • 1/2

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5.

In which of the following reactions H2O2 acts as a reducing agent?
I. H2O2 + 2H+ + 2e- →2H2O
II. H2O- 2e- →O2 + 2H+
III. H2O2 +2e- 2OH-
IV. H2O2+ 2OH- -2e- →O2 + 2H2O

  • I and II

  • III and IV

  • I and III

  • I and III

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6.

The correct statement for the molecule, CsI3 is 

  • It is a covalent molecules

  • It contains Cs+ and I3-

  • It contains Cs3+ and I- ions

  • It contains Cs3+ and I- ions

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7.

For which of the following molecule significant μ≠ 0?

  • only a

  • a and b

  • Only c

  • Only c

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8.

For the estimation of nitrogen 1.4g of an organic compound was digested by Kjeldahl's method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralisation. The percentage of nitrogen in the compound is 

  • 6%

  • 10%

  • 3%

  • 3%

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9.

The resistance of 0.2 M solution of an electrolyte is 50 Ω. The specific conductance of the solution of 0.5 M solution of the same electrolyte is 1.4 S m-1 and resistance of the same solution of the same electrolyte is 280 Ω. The molar conductivity of 0.5 M solution of the electrolyte in Sm-2 mol-1 is

  • 5 x 10-4

  • 5 x 10-3

  • 5 x 103

  • 5 x 103

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10.

The equivalent conductance of NaCl at concentration C at infinite dilution are λC and λ respectively. The correct relationship between λC and λ  is given as (where the constant B is positive)

  • λC = λ +(B)C

  • λC = λ -(B)C

  • λC = λ -(B)square root of straight C

  • λC = λ -(B)square root of straight C

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