Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The correct order of magnitude of bond angles among the compounds CH4, NHand H2O is

  • CH4 > H2O < NH3

  • H2O < NH3 < CH4

  • NH3 < CH4 < H2O

  • NH3 < H2O < CH4


2.

The dissociation equilibrium of a gas AB2 can be represented as

2AB2 (g) 2AB (g) + B2(g)

The degree of dissociation is 'x' and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is

  • 2Kpp

  • 2Kpp13

  • 2Kpp12

  • Kpp


3.

A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH4+ is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1. 8 x 10-5, what is the pH of this solution? (log 2. 7 =0. 43).

  • 9.43

  • 11.72

  • 8.73

  • 9.08


4.

If a gas expands at constant temperature indicates that

  • kinetic energy of molecules decreases

  • pressure of the gas increases

  • kinetic energy of molecules remains as same

  • number of the molecules of gas increase


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5.

If n = 6, the correct sequence for filling of electrons will be

  • ns (n - 1)d (n - 2)f np

  • ns (n - 2)f np (n - 1)d

  • ns np (n - 1)d (n - 2)f

  • ns (n - 2)f (n - 1)d np


6.

Which of the following is least likely to behave as Lewis base?

  • NH3

  • BF3

  • OH-

  • H2O


7.

For the reaction, N2(g) + O2(g)  2NO (g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction, 2NO(g) + O2)g)  2NO2(g). What is K for the reaction, NO2(g) 12N2 (g) + O2(g) ?

  • 14K1K2

  • 1K1K212

  • 1K1K2

  • 12K1K2


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8.

The angular shape of ozone molecule (O3) consists of

  • 1 sigma and 2 pi bonds

  • 2 sigma and 2 pi bonds

  • 1 sigma and 1 pi bonds

  • 2 sigma and 1 pi bonds


D.

2 sigma and 1 pi bonds

Single bond contains= 1 σ bond

Double bond contains = 1 σ bond + 1 π bonds

Triple bond contains= 1σ bond + 2 π bonds

The molecule of O3 is bent with an angle 116.8° and equal O - O distance of 128 pm. The ozone molecule consists of 2 sigma and 1 pi bonds. The angular shape of molecule is represented as


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9.

Among the following the molecule possessing highest dipole moment is

  • CO2

  • BF3

  • SO2

  • Trans-2-butene


10.

An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is λ. What is the circumference of the fourth orbit?

  • 2λ

  • 2λ

  • 4λ 

  • 4λ


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