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The P^(H) of an aqueous solution of NH4...

The `P^(H) ` of an aqueous solution of `NH_4 CN( K_a of HCN is 9.2 xx 10^(-10) & K_b of NH_4 OH is 1.8 xx 10^(-5)) `

A

` gt 7`

B

` lt 7`

C

` 7`

D

` 14`

Text Solution

Verified by Experts

The correct Answer is:
A
` pH =7+ ( (pKa- pKb)/(2) ) `
` =7+ [( (10 -log 9.2)- (5 - log 1.8))/(2) ]`
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AAKASH SERIES-IONIC EQUILIBRIUM -LECTURE SHEET (EXERCISE -III LEVEL -I (MAIN ) (Straight Objective Type Questions))
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  4. The hydrolysis constant of CH3 COONa is given by

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  6. The hydrolysis constant of NaX (Ka of HX is 2xx 10 ^(-6)) is

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  9. Which of the following pair of solutions does not form a buffer soluti...

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  10. IM NaCl and IM HCI are present in an aqueous solution. The solution is

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  11. A buffer solution contains a weak acid HA and A . When small quantity ...

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  12. Which of the following is correct for acid buiter? [salt = S, acid = A...

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  13. On diluting a buffer solution, its pH :

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  14. For the buffer solution containing NH(4)OH and NH(4) CI, P^(H) of the ...

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  15. An acidic buffer contains equal concentration of acid and salt . The d...

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  16. K(a) for HCN is 5 xx 10^(-10) at 25^(@)C . For maintaining a constant ...

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  17. pH of a mixture of HA and A^(-) buffer is 5. Kb of A^(-) =10 ^(-10 )...

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  18. A buffer solution contains 0.2 mole of NH4 OH and 0.2 mole of NH4 Cl...

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  19. From the following table {:("Buffer solution ", "Vol .of 0.1 M weak ac...

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  20. Which buffer solution has maximum pH?

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