The ratio of volumes of CH3COOH 0.1 (N) to CH3COONa 0.1 (N) requi

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 Multiple Choice QuestionsMultiple Choice Questions

661.

Which of the following is strongest Bronsted base?

  • ClO-

  • ClO2-

  • ClO3-

  • ClO4-


662.

When the temperature of reactions will increase then the effect on pH value will

  • increase

  • decrease

  • first increases then decreases

  • remains same.


663.

Consider the following salts : NaCl, HgCl2, Hg2Cl2, CuCl2, CuCl and AgCl. Identify the correct set of insoluble salts in water.

  • Hg2Cl2, CuCl, AgCl

  • Hg2Cl, CuCl, AgCl

  • Hg2Cl2, CuCl2, AgCl

  • Hg2Cl2, CuCl, NaCl


664.

The pH of aqueous solution ofammonium formate is (pKa of HCOOH = 3.8 and pKb of NH3= 4.8)

  • 7

  • 6.0

  • 6.5

  • 8.9


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665.

The pH value of decinormal solution of NH4OH which is 20% ionised is

  • 12.95

  • 12.30

  • 14.70

  • 13.30


666.

For the reaction,
2SO2 (g) + O2 (g) 2SO3 (g) at 300 K, the value of G° is -690.9 R. The equilibrium constant value for the reaction at that temperature is (R is gas constant)

  • 10 atm-1

  • 10 atm

  • 10

  • 1


667.

In which of the following reaction Kp> Kc ?

  • PCl3 + Cl3 PCl5

  • H2+I2 2HI

  • 2SO3  O2 + 2SO2

  • N2+ 3H2  2NH3


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668.

The ratio of volumes of CH3COOH 0.1 (N) to CH3COONa 0.1 (N) required to prepare a buffer solution of pH 5.74 is (Given pKa of CH3COOH is 4.74)

  • 10 : 1

  • 5 : 1

  • 1 : 5

  • 1 : 10


D.

1 : 10

Given, that

pH = 5.74; pKa = 4.74

Suppose that volume of acid solution = x L

Volume of salt solution = y L

From Henderson equation,

pH = pKa + log SaltAcid

or, pH - pKa = log CH3COONaCH3COOH

or, 5.74 - 4.74 = 1 = log CH3COONaCH3COOH

or, CH3COONaCH3COOH = 10 

or, CH3COOHCH3COONa = 110 = 0.1xx + y0.1 yx + y

Thus, xy = 110


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669.

Which of the following is a characteristic of a reversible reaction?

  • It never proceeds to completion

  • It can be influenced by a catalyst

  • It proceeds only in forward direction

  • Number of moles of reactants and products are equal.


670.

The equilibrium constant of a reaction is 300. If the volume of a reaction flask is trippled, the equilibrium constant will be

  • 300

  • 100

  • 600

  • 150


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