Important Questions of Equilibrium Chemistry | Zigya

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41.

In which of the following mixed aqueous solutions, pH =pKat equilibrium?

(1) 100 mL of 0.1 M CH3COOH +100mL 0.1 M CH3COONa.

(2) 100 mL of 0.1 M CH3COOH  + 50 mL of 0.1 M NaOH.

(3) 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH.

(4) 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NH3.

  • (1) is correct

  • (2) is correct

  • (3) is correct

  • Both (1) and (2) are correct


42.

Consider the following salts : NaCl, HgCl2, Hg2Cl2, CuCl2, CuCl and AgCl.

Identify the correct set of insoluble salts in water.

  • Hg2Cl2, CuCl, AgCl

  • HgCl2, CuCl, AgCl

  • Hg2Cl2, CuCl2, AgCl

  • Hg2Cl2, CuCl, NaCl


43.

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


44.

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is

I. H3N- CH(CH3)CO2H

II. H2N - CH(CH3)CO2-

III. H3N+-CH(CH3)CO2-

IV. H2N-CH(CH3)CO2H

  • I and II

  • I and III

  • II and III

  • III and IV


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45.

The correct statement regarding the following energy diagrams is

        

  • Reaction M is faster and less exothermic than reaction N

  • Reaction M is slower and less exothermic than reaction N

  • Reaction M is faster and more exothermic than reaction N

  • Reaction M is slower and more exothermic than reaction N


46.

At 25°C, the solubility product of salt of MX2 type is 3.2 × 10-8 in water. The solubility (in mol/L) of MX2 in water at the same temperature will be

  • 1.2 × 10-3

  • 2 × 10-3

  • 3.2 × 10-3

  • 1.75 × 10-3


47.

The different colours of litmus in acidic, neutral and basic solutions are, respectively.

  • red, orange and blue

  • blue, violet and red

  • red, colourless and blue

  • red, violet and blue


48.

The correct order of equivalent conductances at infinite dilution in water at room temperature for H+, K+, CH3COO- and HO- ions is

  • HO- > H+ > K+ > CH3COO-

  • H+ > HO- > K+ > CH3COO-

  • H+ > K+ > HO- > CH3COO-

  • H+ > K+ > CH3COO- > HO-


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49.

The pH of 10-4 M KOH solution will be

  • 4

  • 11

  • 10.5

  • 10


50.

For a chemical reaction at 27°C, the activation energy is 600 R. The ratio of the rate constants at 327°C to that of at 27°C will be

  • 2

  • 40

  • e

  • e2


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