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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

4 ml

B

7.95 ml

C

2 ml

D

9.3 ml

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The correct Answer is:
C
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AAKASH SERIES-REVISION EXERCISE -CHEMICAL EQUILIBRIUM
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  6. A solution is prepared by mixing 100 ml of 0.1 M NH(4) OH and 200 ml ...

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  7. A one litre solution contains 0.08 mole of acetic acid (K(a) = 1.75 xx...

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  9. A buffer solution is prepared by mixing CH(3) COONa and CH(3) COOH. Th...

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  10. A solution contains equimolar concentration of a weak acid HA and its ...

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  11. A buffer solution consists of 1 mole each of HA and its conjugate base...

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  12. In an acidic buffer solution (pH = 4.4) , the concentration ratio of a...

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  13. 4 mole of NH(4) OH and 1 mole of H(2) SO(4) are mixed and dilute to 1 ...

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  14. When CO(2) is bubbled in excess of water , the following equilibrium i...

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  15. pH of a buffer solution decreases by 0.02 units when 0.12 g of acetic ...

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  16. 20 mL of 0.1 M acetic acid is mixed with 50 mL of potassium acetate. K...

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  17. Let the solubilities of AgCl in H2 O , 0.01 M CaCl(2) , 0.01 M NaCl an...

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  18. At 298 K , the K(sp) of M(2) SO(4) is 3.2 xx 10^(-5) . The maximum con...

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  19. The pH of the neutralisation point of 0.1 N NaOH with 0.1 N HCl is

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