The correct order in aqueous medium of basic strength in case of methyl substituted amines is :
Match the List-I with List-II :
| List-I Cations |
List-II Group reagents |
||
|---|---|---|---|
| A. | $$\mathrm{Pb^{2+},Cu^{2+}}$$ | i) | $$\mathrm{H_2S}$$ gas in presence of dilute HCl |
| B. | $$\mathrm{Al^{3+},Fe^{3+}}$$ | ii) | $$\mathrm{(NH_4)_2CO_3}$$ in presence of $$\mathrm{NH_4OH}$$ |
| C. | $$\mathrm{Co^{2+},Ni^{2+}}$$ | iii) | $$\mathrm{NH_4OH}$$ in presence of $$\mathrm{NH_4Cl}$$ |
| D. | $$\mathrm{Ba^{2+},Ca^{2+}}$$ | iv) | H2S in presence of NH4OH |
Correct match is -
The density of a monobasic strong acid (Molar mass 24.2 g/mol) is 1.21 kg/L. The volume of its solution required for the complete neutralization of 25 mL of 0.24 M NaOH is __________ $$\times$$ 10$$^{-2}$$ mL (Nearest integer)
A litre of buffer solution contains 0.1 mole of each of NH$$_3$$ and NH$$_4$$Cl. On the addition of 0.02 mole of HCl by dissolving gaseous HCl, the pH of the solution is found to be _____________ $$\times$$ 10$$^{-3}$$ (Nearest integer)
[Given : $$\mathrm{pK_b(NH_3)=4.745}$$
$$\mathrm{\log2=0.301}$$
$$\mathrm{\log3=0.477}$$
$$\mathrm{T=298~K]}$$
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