Which of the following mixtures forms an acid buffer? from Chemi

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 Multiple Choice QuestionsMultiple Choice Questions

221.

The slope of the graph drawn between ln k and 1T as per Arrhenius equation gives the value (R = gas constant; Ea = Activation energy)

  • REa

  • EaR

  • -EaR

  • -REa


222.

(i) H3PO4(aq)   H+ (aq) + H2PO4-(aq)(ii) H2PO4-(aq)  H+ (aq) + HPO42- (aq)(iii) HPO42- (aq)  H+(aq) + PO43-(aq)

The equilibrium constants for the above reactions at a certain temperature are K1, K2 and K3 respectively. The equilibrium constant for the reaction H3PO4(aq) 3H+(aq) + PO43- (aq) in terms of K1, K2 and K3 is 

  • K1+ K2 + K2

  • K1K2+K3

  • K3K1K2

  • K1K2K3


223.

The equilibrium constant (Kc) for the following equilibrium 2SO2(g) + O2(g)  2SO3(g) at 563 K is 100. At equilibrium, the number of moles of SO3 in the 10 litre flask is twice the number of moles of SO2 , then the number of moles of oxygen is

  • 0.4

  • 0.3

  • 0.2

  • 0.1


224.

The relation between Kp and Kc is correctly shown as

  • Kc = Kp (RT)ng

  • Kp = Kc (RT)-ng

  • Kp = Kc (RT)ng

  • Kc = Kp (RT)-ng


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225.

In the formation of SO3 according to following equilibrium 2SO2 + O2  2SO3 + heat, which conditions favour the formation of SO3?

  • Low pressure

  • Low concentration of oxygen

  • Low temperature and use of catalyst

  • High temperature without using catalyst


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226.

Which of the following mixtures forms an acid buffer?

  • NaOH + HCl

  • CH3COOH + CH3COONa

  • NH4OH + NH4Cl

  • H2CO3 + (NH4)2CO3


B.

CH3COOH + CH3COONa

Acidic buffer is the mixture of weak acid and salt of such acid with strong base.

e.g. CH3COOH + CH3COONa


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227.

When NH4Cl is added to NH4OH solution, the dissociation of ammonium hydroxide is reduced. It is due to

  • common ion effect

  • hydrolysis

  • oxidation

  • reduction


228.

Strongest Bronsted base among the following anions is

  • ClO-

  • ClO2-

  • ClO3-

  • ClO4-


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229.

pH of a solution is 4. The hydroxide ion concentration of the solution would be

  • 10-4

  • 10-10

  • 10-2

  • 10-12


230.

Heat of neutralisation of NH4OH and HCl is

  • equal to 13.7 kcal

  • more than 13.7 kcal

  • less than 13.7 kcal

  • more than one is correct


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