When one mole of A and one mole of B were heated in one litre fla

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421.

When one mole of A and one mole of B were heated in one litre flask at T(K), 0.5 mole of C was formed in the equilibrium,  A + B  C + D the equilibrium constant, Kc is

  • 0.25

  • 0.5

  • 1

  • 2


C.

1

                           A    +    B     C + Dinitial moles    1              1           0       0Moles at eq.   (1-x)   (1-x)      x       xGivenx= 0.5(1-x) = 0.5 molKc= CDAB= 0.5 × 0.50.5 ×0.5=1


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422.

If the solubility of Ca3(PO4)2 in water is x mol L-1, its solubility product in mol5L-5 is

  • 6x5

  • 36x5

  • 64x5

  • 108x5


423.

The buffer system which helps to maintain the pH of blood between 7.26 to 7.42, is

  • H2CO/HCO3-

  • NH4OH/ NH4Cl

  • CH3COOH/ CH3COO-

  • CH3COONH4


424.

Which one of the following is correct?

  • The equilibrium constant (Kc) is independent of temperature

  • The value of Kc is independent of initial concentrations of reactants and products

  • At equilibrium, the rate of the forward reaction is twice the rate of the backward reaction.

  • The equilibrium constant (Kc) for the reaction

    Ni(s) + 4CO(g)  Ni(CO)4(g) is, Ni(CO)4CO


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425.

pH of an aqueous solution of NH4Cl is

  • 7

  • >7

  • <7

  • 1


426.

Which of the following statement is correct ?

  • BCland AlCl3 are both Lewis acids and AlCl3 is stronger than BCl3

  • BCl3 and AlCl3 are both equally strong Lewis acid

  • Both BCl3 and AlCl3 are not Lewis acid

  • BCl3 and AlCl3 are both Lewis acids and BCl3 is stronger than AlCl3


427.

Identify the Bronsted acid in the following equation

PO43- + H2O(l)  HPO42- (aq) + OH- (aq)

  • PO43-

  • HPO4

  • H2O

  • OH-


428.

For the reaction, 2HI (g) H2 (g) + I2 (g) the degree of dissociation (α) of HI (g) is related to equilibrium constant Kp by the expression

  • 1 + 2Kp2

  • 2Kp1+ 2Kp

  • 2Kp1 + 2Kp

  • 1 + 2Kp2


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429.

Rank the following in decreasing order of basic strength

(i) CH3-CH2-C≡C-

(ii) CH3-CH2-S-

(iii) CH3-CH2-CO2-

(iv) CH3-CH2-O-

  • (iv) > (i) > (ii) > (iii)

  • (i) > (iv) > (ii) > (iii)

  • (i) > (iv) > (iii) > (ii)

  • (ii) > (i) > (iv) > (iii)


430.

If solubility product of Zr3(PO4)4 is denoted by Ksp and its molar solubility is denoted by S, then which of the following relation between S and Ksp is correct ?

  • S = Ksp691217

  • S = KSP92919

  • S = Ksp14416

  • S = Ksp21617


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