Strongest Bronsted base among the following anions is 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


226.

Which of the following mixtures forms an acid buffer?

  • NaOH + HCl

  • CH3COOH + CH3COONa

  • NH4OH + NH4Cl

  • H2CO3 + (NH4)2CO3


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


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228.

Strongest Bronsted base among the following anions is

  • ClO-

  • ClO2-

  • ClO3-

  • ClO4-


A.

ClO-

Conjugate base of strong acid will be weak and conjugate base of weak acid will always be strong. 

In case of oxy acid of same element as oxidation number of element increases their acidic strength will also  increase.

In HClO oxidation number of chlorine is +1, so HClO is weakest acid and ClO- is strongest base.


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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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