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The pK(a) of an acid HA is 4.77 and pK(b...

The `pK_(a)` of an acid HA is 4.77 and `pK_(b)` of a base of BOH is 4.75 . The pH of 0.1 M aqueous solution of the salt AB is

A

7.02

B

7.01

C

6.99

D

`7.00`

Text Solution

Verified by Experts

The correct Answer is:
B
AB is a salt of weak acid and weak base.
`pH=7+1/2 pK_a -1/2pK_b`
`pK_a=4.77,pK_b`=4.75
`therefore pH=7+1/2xx4.77-1/2xx4.75`=7.01
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MODERN PUBLICATION-EQUILIBRIUM-Objective B.(MCQs)
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  2. For the reaction N(2)(g)+O(2)(g) hArr 2NO(g), the equilibrium constant...

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  4. Which of the following will decrease the pH of a 50 ml solution of 0.0...

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  6. Buffer solutions have constant acidity and alkalinity because

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  8. Which of these is least likely to act as Lewis base?

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  9. For the reaction 2A3 hArr 3A2 the equilibrium constant and the DeltaG...

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  10. The pKa of a weak acid HA and pkb of a weak base BOH are 4.60 and 4.80...

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  11. For a given exothermic reaction , K(p) and k'(p) are the equilibrium c...

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  12. For the chemical reaction N(2)(g)+3H(2)(g)hArr2NH(3)(g) The correc...

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  13. Which of the following salts will give highest pH in water?

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  14. Using the Gibb's energy change , DeltaG^@=+63.3 kJ , for the following...

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  15. At 800 K in a sealed vessel for the equilibrium N(2)(g) + O(2) (g) hAr...

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  16. Which one of the following species cannot act as both Bronsted acid a...

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  17. The K(sp) of Ag(2)CrO(4),AgCl,AgBr and AgI are respectively, 1.1xx10^(...

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  18. What is the pH of the resulting solution when equal volumes of 0.1 M N...

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

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