Acccording to significant figure convention the result obtained b

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


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-


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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


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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


B.

31.1

According to significants figure convention, during adding the number of decimal places in the answer should not exceed the number of  decimal places in either the numbers

12.1118.011.01231.122

18.0 has only one digit aftyer the decimal point, thus the result should be reported only upto one digit after the decimal point which is 31.1.


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