Important Questions of Equilibrium Chemistry | Zigya

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191.

In which of the following reactions, the concentration of product is higher than the concentration of reactant at equilibrium? (K = equilibrium constant)

  •  B; K = 0.001

  •  N; K = 10

  •  Y; K = 0.005

  •  P; K = 0.01


192.

Study the following table:
Buffer solution Volume (in mL) of 0 M weak acid Volume (in mL) of 0.1 M sodium salt of weak acid
I 4.0 4.0
II 4.0 40.0
III 40.0 4.0
IV 0.1 10.0

Which of the two sets of butter solutions have least pH?

  • I and II

  • I and III

  • II and III

  • II and IV


193.

Assertion (A): The pH of a buffer solution containing equal moles of acetic acid and sodium acetate is 4.8 (pKof acetic acid is 4.8).

Reason (R): The ionic product of water at 25°C is 10-14mol2.L-2. The correct answer is

  • Both (A) and (R) are true and (R) is the correct explanation of (A)

  • Both (A) and (R) are true and (R) is not the correct explanation of (A)

  • (A) is true but (R) is not true

  • (A) is not true but (R) is true


194.

At 550 K, the Kc for the following reaction is 104 mol-1X(g) + Y (g)  Z(g). At equilibrium, it was observed that [X] =12[Y] =12[Z]. What is the value of [Z] (in mol L-1) at equilibrium?

  • 2 × 10-4

  • 10-4

  • 2 × 104

  • 104


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195.

The pH of a solution of H2O2 is 6.0. Some chlorine gas is bubbled into this solution. Which of the following is correct?

  • The pH of resultant solution becomes 8.0

  • Hydrogen gas is liberated from resultant solution

  • The pH of resultant solunon becomes less than 6.0 and oxygen gas is liberated

  • Cl2O is formed in the resultant solution


196.

Which of the following is not a characteristic property of chemical equilibrium ?

  • Rate of forward reaction is equal to rate of backward reaction at equilibrium.

  • After reaching the chemical equilibrium, the concentrations of reactants and products remain unchanged with time.

  • For A (g)  B (g), Kc is 10-2. If this reaction is carried out in the presence of catalyst, the value of Kc decreases.

  • After reaching the equilibrium, both forward and backward reactions continue to take place.


197.

50 mL of H2O is added to 50 mL of 1 × 10-3 M barium hydroxide solution. What is the pH of the resulting solution ?

  • 3.0

  • 3.3

  • 11.0

  • 11.7


198.

In a 500 mL flask, the degree of dissociation of PCl5 at equilibrium is 40% and the initial amount is 5 moles. The value of equilibrium constant in mol L-1 for the decomposition of PCl5 is

  • 2.33

  • 2.66

  • 5.32

  • 4.66


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199.

Boron halides behave as Lewis acids because of their  .......... nature.

  • proton donor

  • covalent

  • electron deficient

  • ionising


200.

Which of the following is not a conjugate acid-base pair?

  • HPO32-, PO33-

  • H2PO4-, HPO42-

  • H2PO4-, H3PO4

  • H2PO4-, PO33-


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