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A 2.5 gm impure sample containing weak m...

A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. =45) is dissolved in 100 ml water and titrated with 0.5 M HCl when `(1/5)^(th)` of the base was neutralised the pH was found to be 9 and at equivalent point pH of solution is 4.5. Given: All data at `25^@C & log 2= 0.3.` Select correct statement(s).

A

`K_b` of base is less than `10^(-6)`

B

Concentration of salt

C

at equivalent point is 0.25 M

D

Volume of HCl is used at equavalent point is 100 ml

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The correct Answer is:
B, C
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MOTION-IONIC EQUILIBRUIM-Exercise -2 (Level -II)
  1. Which of the following statement(s) is/are correct?

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  2. A 2.5 gm impure sample containing weak monoacidic base (Mol. wt. =45) ...

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  3. Select incorrect statement(s).

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  4. Which of the following is true for alkaline aqueous solution?

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  5. A buffer solution can be prepared from a mixture of

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  6. A solution contains 0.09 HC1, 0.09 M CHC1(2)COOH, and 0.1M CH(3)COOH. ...

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  7. A solution of chloroacetic acid, ClCH2COOH containing 9.45 grams in 50...

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  8. The Kw of water at two different temperature is : T" "25^@C" "...

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  9. The equilibrium constant of the reaction. 2Ag(s) + 2I^(-)– + 2H2O Le...

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  10. When a 40 mL of a 0.1 M weak base in titrated with 0.16 M HCl, the pH ...

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  11. How many moles of sodium hydroxide can be added to 1.00 L of a solutio...

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  12. 20 mol of M//10 CH(3)COOH solution is titrated with M//10 NaOH solutio...

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  13. Calculate the OH– concentration and the H3PO4 concentration of a solut...

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  14. Solubility product of AgCl is 2.8xx10^(-10) at 25^(@)C. Calculate solu...

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  15. K(a) for the ionisation of Fe^(3+) to Fe(OH)^(2+) and H^(o+) is 6.5 xx...

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  16. A solution of weak acid HA was titrated with base NaOH. The equivalent...

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  17. A weak base BOH was titrated against a strong acid. The pH at 1/4 the ...

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  18. At 25^@C, will a precipitate of Mg(OH)2 form in a 10^(-4)M solution of...

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  19. What is the solubility of AgCl in 0.20 M NH3 ? Given : K(sp)(AgCl) =...

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  20. Equal volumes of 0.02 M AgNO3 and 0.02 M HCN were mixed. Calculate [Ag...

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