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

`K_(a)` for HCN is `5 xx 10^(-10)` at `25^(@)C` . For maintaining a constant pH of 9 , the volume of 5M KCN solution required to be added to 10 ml of 2M HCN solution is

A

4ml

B

8ml

C

2ml

D

10ml

Text Solution

Verified by Experts

The correct Answer is:
C
` pH = 9 = pKa+ log ""([S])/([A]) `
` 9= 10 -log 5 + log ""(5xx V)/(2xx 10 ) `
` log"" (V)/(4) = log ^(5) - 1 rArr (V)/(4) =(5)/(10 ) `
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AAKASH SERIES-IONIC EQUILIBRIUM -LECTURE SHEET (EXERCISE -III LEVEL -I (MAIN ) (Straight Objective Type Questions))
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  2. An acidic buffer contains equal concentration of acid and salt . The d...

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

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

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

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

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  7. Which buffer solution has maximum pH?

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  8. Buffer capacity of acidic buffer solution is maximum when (1) P^(H)...

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  9. When 0.02 mole of an alkali is added to an acid buffer , the pH change...

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  10. Aqueous solution of KCI is neutral because

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  11. Assertion (A) : Aqueous solutions of ZnSO4 is neutral. Reason ( R ...

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  12. (A): Aqueous solution of Na(2)CO(3) is acidic in nature (R): Na^(+) ...

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  13. The no.of hydroxyl ions produced by one molecule of Na(2),CO(3) , on h...

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  14. The nature of 0.1 M solution of sodium bisulphate is

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  15. In the titration of acetic acid versus sodium hydroxide , the pH of th...

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  16. The P^(H) of an aqueous solution of NH4 CN( Ka of HCN is 9.2 xx 10^(-...

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  17. The hydrolysis constant of CH3 COONa is given by

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  18. Hydrolysis constant of salt derived from strong acid and weak base is ...

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

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  20. The P^(H) of 0. 1M solution of the following compounds increases i...

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