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pH of a 1 L buffer solution changes from...

pH of a 1 L buffer solution changes from 4.5 to 4.6 when 0.2 mole of a strong base is added to it. Its buffer capacity will be

A

3

B

4

C

1

D

2

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The pH of a buffer solution is 4.745 . When 0.044 mole of Ba(OH)_(2) is added to 1 lit. of the buffer, the pH changes to 4.756 . Then the buffer capcity is 4

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A solution capable of maintaining its pH relatively constatn, when either excess acid or excess base is added, is said to be buffered While it is not usually considered a buffered solution, a concentrated solution (10^(-2) M and higher) of a strong acid or stong base is buffered against large changes in pH when acids or bases are added. Buffered solutions are usually those containing a wealk acid and a salt of that weak acid or a weak base and the salt of that weak base. For example a solution containing HAc and NaAC resists large change in pH when acid or alkali is added. For a buffer solution Buiffer capacity is defined as the number of moles of a strong acid or a strong base that causes 1 of the buffer to undergo a 1 unit change in pH. Buffer capacity is maximum when the molar ratio of the two components is unity and the buffer solution is considerred good. Which solution is not a buffer solution ?

AAKASH INSTITUTE-TEST 2-EXERCISE
  1. Which of the following is not a Lewis acid?

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  2. In the equilibirum mixture br CaCO3(s) ⇋ CaO(s) + CO(2g). Pressure...

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  3. pH of a 1 L buffer solution changes from 4.5 to 4.6 when 0.2 mole of a...

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  4. Kp for the equation A(s)⇋ B(g) + C(g) + D(s) is 9 atm^2 . Then the t...

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  5. For (i) A + B ⇋ C Kc = K1 (ii) 2C⇋D Kc=K2 Then the value of Kc fo...

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  6. Which of the following salt will have pH less than 7 when dissolved in...

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  7. If the value of Ka of 1 M HCN is 10^(-5) then its degree of dissociat...

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  8. pH of which salt is same for 1 M and 5 M solution both?

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  9. pH of an acidic buffer solution is 5.74 and PK (CH3COOH) = 4.74 then ...

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  10. If pressure applied on the following reaction becomes four times H2(g)...

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  11. For two reactions in equilibrium in same container (i) A(s) ⇋ 2B(9)...

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  12. For the following reaction Ag2SO4(s) ⇋ 2Ag^+ (aq) + SO4^(2-) (aq) Mo...

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  13. Zeroth law of thermodynamics states that

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  14. Which of the following can be correct?

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  15. The difference between the value of Cp of H2 and Cv of He will be

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  16. Expansion of ideal gas takes place from 1 L to 10 L in vacuum isotherm...

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  17. The value of ΔH and ΔU will be same for

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  18. ΔU = 0 always when in a process

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  19. Surface tension is

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  20. The ratio of Vrms of O2 and VMP of SO2 at room temperature will be

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