Important Questions of Equilibrium Chemistry | Zigya

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321.

Consider the following gaseous equilibria with equilibrium constants K1 and K2 respectively.

SO2(g) + 12O2(g) SO3(g)2SO3(g)  2SO2 (g) + O2(g)The equilibrium constants are related as

  • K12 = 1K2

  • 2K1= K22

  • K2=2K12

  • K22=1K1


322.

In the reversible reaction,

A(s) + B(g) ⇌ C (g) + D(g) ΔG° = -350kJ

Which one of the following statements is true?

  • The entropy change is negative

  • Equilibrium constant is greater than one

  • The reaction should be instantaneous

  • The reaction is thermodynamically not feasible


323.

Consider the folowing equilibria with equilibrium constants K1 and K2 respectively,

SO2  (g) + 12O2 (g)  SO3 (g)

2SO3 (g)  2SO2 (g) + O2 (g)

The equilibrium constants are related as

  • 2K1 = K22

  • K12 = 1K2

  • K22 = 1K1

  • K2 = 2K12


324.

0.023 g of sodium metal is reacted with 100cm3 of water. The pH of the result solution is

  • 10

  • 11

  • 9

  • 12


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325.

A buffer solution contains 0.1 mole of sodium acetate in 1000 cm3 of 0.1 M acetic acid. To the above buffer solution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is equal to

  • pKa - log2

  • pKa

  • pK+2

  • pK+ log 2


326.

The activation energy of  a reaction at a given temperature is found to be 2.303 RT J mol-1. The ratio of rate constant to the Arrhenius factor is

  • 0.01

  • 0.1

  • 0.02

  • 0.001


327.

pH value of which one of the following is not equal to one?

  • 0.1 M CH3COOH

  • 0.1 M HNO3

  • 0.05 M H2SO4

  • 50 cm3 0.4 M HCl + 50 cm3 0.2 M NaOH


328.

A buffersolution contains 0.1 mole of sodium acetate dissolved in 1000 cm3 of 0.1 M acetic acid. To the above buffersolution, 0.1 mole of sodium acetate is further added and dissolved. The pH of the resulting buffer is 

  • pKa

  • pKa + 2

  • pKa - log 

  • pKa + log 2


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329.

H2S is passed into one nm3 of a solution containing 0.1 mole of Zn2+ and 0.01 mole of Cu2+ till the sulphide ion concentration reaches to 8.1 × 10-19 moles. Which one of the following statements is true?

[Ksp of ZnS and CuS are 3 × 10-22 and 8 × 10-36 respectively.]

  • Only ZnS precipitates

  • Both CuS and ZnS precipitate

  • Only CuS precipitates

  • No precipitation occurs


330.

0.023 g of sodium metal is reacted with 100 cmof water. The pH of the resulting solution is

  • 10

  • 8

  • 9

  • 12


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