Important Questions of Equilibrium Chemistry | Zigya

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131.

The low solubility of LiF and that of CsI in water are respectively due to which of the following properties of the alkali metal ions?

  • Higher hydration enthalpy of Li, higher lattice enthalpy of Cs+

  • Smaller hydration enthalpy of Li, higher lattice enthalpy of Cs+

  • Smaller lattice enthalpy of Li, higher hydration enthalpy of Cs+

  • Higher lattice enthalpy of Li, smaller hydration enthalpy of Cs+


132.

The relative strength of trichlorides of boron group to accept a pair of electron is given by

  • GaCl3 > AlCl3 > BCl3

  • AlCl3 > BCl3 > GaCl3

  • AlCl3 > GaCl3 > BCl3

  • BCl3 > AlCl3 > GaCl3


133.

If the ionic product of M (OH)2 is 5 × 10-10, then the molar solubility of M(OH)2 in 0.1 M NaOH is

  • 5 × 10-12 M

  • 5 × 10-8 M

  • 5 × 10-10 M

  • 5 × 10-9 M


134.

Equilibrium constants are given for the following two equilibria.

(i) A2 (g) + B2 (g)  2AB (g); K = 2 × 10-4 L mol-1

(ii) 2AB (g) + C2 (g)  2ABC (g); K = 2 × 10-2 L mol-1

Calculate the equilibrium constant for the following equilibrium.

ABC (g)  12A2 (g) + 12B2 (g) + 12C2 (g)

  • 500 mol1/2 L-1/2

  • 500 mol1/2 L1/2

  • 4 × 10-6 mol1/2 L1/2

  • 200 mol1/2 L-1/2


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135.

The equilibrium constant for the equilibrium PCl5 (g) PCl3 (g) + Cl2 (g) at a particular temperature is 2 × 10-2 mol L-1. The number of moles of PCl5 that must be taken in a one litre flask at the same temperature to obtain a concentration of 0.20 mole of chlorine at equilibrium is

  • 2.2

  • 2.0

  • 1.8

  • 0.2


136.

The correct increasing order of the acid strength of benzoic acid (I), 4-nitrobenzoic acid (II), 3,4-dinitrobenzoic acid (III) and 4-methoxybenzoic acid (IV) is

  • I < II < III < IV

  • II < I < IV < III

  • IV < I < II < III

  • IV < II < I < III


137.

Choose the correct order of decreasing basic strength of the following compounds in aqueous solution

(i) C6H5NH2

(ii) C2H5NH2

(iii) NH3

(iv) (CH3)2NH

  • (i) > (ii) > (iii) > (iv)

  • (iv) > (ii) > (iii) > (i)

  • (ii) > (i) > (iii) > (iv)

  • (iv) > (iii) > (ii) > (i)


138.

The salt of an alkali metal gives violet colour in the flame test. Its aqueous solution gives a white precipitate with barium chloride in hydrochloric acid medium. The salt is

  • K2SO4

  • KCl

  • Na2SO4

  • K2CO3


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139.

The values of limiting ionic conductance of H+ and HCOO- ions are respectively 347 and 53S cm2 mol-1, the dissociation constant of methanoic acid at 298 K is

  • 2.5 × 10-4

  • 2 × 10-5

  • 2.5 × 10-5

  • 1.5 × 10-4


140.

In a closed cylinder of capacity 24.6 L, the following reaction occurs at 27°C.

A2 (s)  B2 (s) + 2C (g)

At equilibrium, 1 gm of B2 (s) (molar mass = 50 g mol-1) is present. The equilibrium constant Kp for the equilibrium in atm2 unit is 

(R = 0.082 L atm K-1 mol-1)

  • 1.6 × 10-2

  • 1.6 × 10-5

  • 1.6 × 10-3

  • 1.6 × 10-4


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