The equation used to represents the electron gain enthalpy is fr

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Which one of the following is not a state function?

  • Internal energy

  • Work

  • Entropy

  • Free energy


2.

The number of radial nodes present in 3p orbital is

  • 0

  • 1

  • 2

  • 3


3.

The radiation with maximum frequency is

  • X-ray

  • radio waves

  • UV rays

  • IR rays


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4.

The equation used to represents the electron gain enthalpy is

  • X(g) + e- → X-(g)

  • X(s) + e- → X-(g)

  • X(g) → X+(g) + e-

  • X(s) → X+(g) + e-


A.

X(g) + e- → X-(g)

When an electron is added to a gaseous atom in its ground state to convert it into a negative ions, the enthalpy change accompanying process is called electron gain entalpy (Δeg H) 

It is a direct measure of the ease with which an atom attracts an electron to form anion,

X(g) + e- → X-(g), (Δeg H) 

 


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5.

An element in +2 oxidation state has 24 electrons. The atomic number of the element and the number of unpaired electrons in it respectively are

  • 24 and 4

  • 26 and 4

  • 24 and 2

  • 26 and 5


6.

Number of bonding electron pairs and number of lone pairs of electrons in ClF3, SF4, BrF5 respectively are

  • 3, 2, 4, 2, 5, 2

  • 3, 1, 4, 1,5, 2

  • 3, 1, 4, 2, 5, 1

  • 3, 2, 4, 1, 5, 1


7.

What is the bond order of N2 ?

  • 3

  • 4

  • 2

  • 1


8.

Match the following
List I List II
(A) Viscosity (I) Critical temperature
(B) Ideal gas behaviour (II) Isobar
(C) Liquefaction of gases (III) Compressibility factor
(D) Charles'law (IV) kg s-2
  (V) kgm-1s-1

The correct answer

  • A-IV, B-III, C-I, D-II

  • A-V, B-III, C-I, D-II

  • A-V, B-III, C-II, D-I

  • A-IV, B-III, C-II, D-I


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9.

The most probable speed of O2, molecules at T(K) is

  • RT4π

  • RT16π

  • RT16

  • 3RT32


10.

Acccording to significant figure convention the result obtained by adding 12.11, 18.0 and 1.012 is

  • 31.12

  • 31.1

  • 31

  • 31.122


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