Important Questions of Equilibrium Chemistry | Zigya

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451.

Given the reaction between two gases represented by A2 and B2 to give the compound AB (g).
A2(g) +B2 (g)  ⇌ 2AB (g)
At equilibrium the concentration
of A2 = 3.0 x 10-3 M
of B2 = 4.2 x 10-3 M
of AB = 2.8 x 10-3 M

If the reaction takes place in a sealed vessel at 527oC, then the value of Kc will be

  • 2.0

  • 1.9

  • 0.62

  • 0.62

1200 Views

452.

A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH4 is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8 x 10-5, what is the pH of this solution?

log ( 2.7 = 0.43)

  • 9.43

  • 11.72

  • 8.73

  • 9.08

981 Views

453.

The value of ΔH for the reaction

X2 (g) + 4Y2 (g) ⇌ 2XY4 (g) is less than zero. Formation of XY4 (g) will be favoured at

  • Low pressure and low temperature

  • high temperature and low pressure

  • high pressure and low temperature

  • high pressure and low temperature

430 Views

454.

For the reaction N2 (g) + O2 (g) ⇌  2NO (g), the equilibrium constant is K1. The equilibrium constant is K2 for the reaction 2NO (g) + O2(g) ⇌ 2NO2 (g). What is K for the reaction NO subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon 1 half straight N subscript 2 space left parenthesis straight g right parenthesis space plus straight O subscript 2 space left parenthesis straight g right parenthesis ? space space

  • 1/(4K1K2)

  • [1/K1K2]1/2

  • 1/(K1K2)

  • 1/(K1K2)

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455.

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

  • 12.65

  • 2.0

  • 7.0

  • 7.0

4508 Views

456.

Which one of the following pairs of the solution is not an acidic buffer?

  • HClO4 and NaClO4

  • CH3COOH and CH3COONa

  • H2CO3 and Na2PO4

  • H2CO3 and Na2PO4

1214 Views

457.

If the equilibrium constant for 

straight N subscript 2 space left parenthesis straight g right parenthesis space plus space straight O subscript 2 space left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space 2 space NO space left parenthesis straight g right parenthesis space is space straight K comma space the space equilibrium space constant space for
1 half straight N subscript 2 space left parenthesis straight g right parenthesis space plus space 1 half straight O subscript 2 left parenthesis straight g right parenthesis space rightwards harpoon over leftwards harpoon space NO space left parenthesis straight g right parenthesis space will space be

  • K1/2

  • K/2

1553 Views

458.

An aqueous solution of which of the following compounds is the best conductor of electric current?

  • Acetic acid C2H4O2

  • Hydrochloric acid, HCl

  • Ammonia, NH3

  • Ammonia, NH3

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459.

If pH ofa saturated solution of Ba(OH)2 is 12, the value of its Ksp is 

  • 4.00 x 10-6 M3

  • 4.00 x 10-7 M3

  • 5.00 x 10-6 M3

  • 5.00 x 10-6 M3

435 Views

460.

What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? 
(Ka for CH3COOH = 1.8 x 10-5 )

  • 3.5 x 10-4

  • 1.1 x 10-5

  • 1.8 x 10-5

  • 1.8 x 10-5

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