The reaction quotient Q is useful in predicting the direction o

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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1.

The reaction quotient 'Q' is useful in predicting the direction of the reaction. Which of the following is incorrect?

  • If Qc < Kc, the forward reaction is favoured

  • If Qc > Kc, the forward reaction is favoured

  • If Qc >Kc, the forward reaction is favoured and Qc =Kc, no reaction occur.

  • None of these


C.

If Qc >Kc, the forward reaction is favoured and Qc =Kc, no reaction occur.

Qc >Kreverse reaction is favored. The product concentration is more than the equilibrium concentration. The reactant concentration is less than the equilibrium concentration. If Qc < Kc  forward reaction is favored.
Qc =Kc the reaction is at equilibrium that is dynamic. Both forward and reverse reactions continue to occur.


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2.

Which of the following structure of a molecule is expected to have three bond pairs and one lone pair of electrons?

  • Octahedral

  • Trigonal planar

  • Pyramidal

  • Tetrahedral


3.

A reaction has both ΔH and ΔS-ve. The rate of reaction

  • increases with increases in temperature

  • cannot be predicted for change in temperature

  • increases with decreases in temperature

  • remains unaffected by change in temperature


4.

The correct set of quantum number for the unpaired electrons of chlorine atoms is

  • 2, 1, -1, +1/2

  • 2, 0, 0,+ 1/2

  • 3, 1, 1, ±1/2

  • 3, 0, 0, ±1/2


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5.

The equilibrium constant for the reaction N2(g) + O2(g) 2NO(g) is 4×10-4 at 200K. In presence of a catalyst the equilibrium is attained ten times faster. Therefore the equilibrium constant in presence of catalyst 2000 K is 

  • 4×10-3

  • 4×10-2

  • 40×10-4

  • 4×10-4


6.

Which of the following is correct electron dot structure of N2O molecule?

  • :N=N=Ö:

  • :NN+-O....:

  • :N..=N=O....

  • :N..=N-O....


7.

If 3.01 × 1020 molecules are removed from 98 mg of H2SO4, then number of moles of H2SO4 left are

  • 0.1 × 10-3 mol

  • 9.95 × 10-2 mol

  • 0.5 × 10-3 mol

  • 1.66 × 10-3 mol


8.

The electronegativities of C, N, Si and P are in the order of

  • P < Si<C < N

  • Si <P < C<N

  • P < Si < N < C

  • Si <P < N <C


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9.

Addition of mineral acid to an aqueous solution of borax, the following compound is formed

  • pyroboric acid

  • boron hydride

  • meta boric acid

  • orthoboric acid


10.

Which one of the following is not a common component of photo-chemical smog?

  • Ozone

  • Acrolein

  • Peroxy acetyl nitrate

  • Chloroflourocarbons


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