Dipole moment of HCl = 1.03 D, HI= 0.38 D. Bond length of HCl = 1

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Given that Hf (H) = 218 kJ/ mol, express the H-H bond energy in kcal/ mol.

  • 52.15

  • 911

  • 104.3

  • 52153


2.

Fluorine reacts with dilute NaOH and forms a gaseous product A. The bond angle in the molecule of A is

  • 104°40'

  • 103°

  • 107°

  • 109°28'


3.

The number of p-dπ 'pi' bonds present in XeO3 and XeO4 molecules, respectively are-

  • 3, 4

  • 4, 2

  • 2, 3

  • 3, 2


4.

The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be 

  • 25 : 9

  • 5 : 3

  • 9 : 25

  • 3 : 5


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5.

Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?

  • Cu2+ > V2+ > Cr2+ > Mn2+

  • Cu2+ < Cr2+ < V2+ < Mn2+

  • Cu2+ < V2+ < Cr2+ < Mn2+

  • V2+ < Cu2+ < Cr2+ < Mn2+


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6.

Dipole moment of HCl = 1.03 D, HI= 0.38 D. Bond length of HCl = 1.3 Å and HI = 1.6 Å. The ratio of fraction of electric charge, δ, existing on each atom in HCl and HI is

  • 12 : 1

  • 2.7 : 1

  • 3.3 : 1

  • 1 : 3.3


C.

3.3 : 1

Dipole moment, μ = δ × d

where, 

δ = magnitude of electric charge

d = distance between particles (here bond length)

 δ = μd

or, δHClδHI = μHClμHI × dHIdHI

            = 1.03 × 1.61.3 × 0.38

            = 3.3 : 1


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7.

1.5 g of CdCl2 was found to contain 0.9 g of Cd. Calculate the atomic weight of Cd.

  • 118

  • 112

  • 106.5

  • 53.25


8.

The average kinetic energy of one molecule of an ideal gas at 27°C and 1 atm pressure is

  • 900 cal K-1 mol-1

  • 6.21 × 10-21 JK-1 molecule-1

  • 336.7 JK-1 molecule-1

  • 3741.3 JK-1 mol-1


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9.

pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic acid is added to 250 mL of a buffer solution of acetic acid and potassium acetate at 27°C. The buffer capacity of the solution is

  • 0.1

  • 10

  • 1

  • 0.4


10.

Which one of the following order is correct for the first ionisation energies of the elements?

  • B < Be < N < O

  • Be < B < N < O

  • B < Be < O < N

  • B < O < Be < N


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