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An aqueous solution contains 0.10 M H2S and 0.20 M HCl. If the equilibrium constant for the formation of HS– from H2S is 1.0 × 10–7 and that of S2– from HS– ions is 1.2 × 10–13 then the concentration of S2– ions in aqueous solution will be:
1. 5 × 10–8 M
2. 3 × 10–20 M
3. 6 × 10–21 M
4. 5 × 10–19 M
Subtopic: Ionisation Constant of Acid, Base & Salt |
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Level 2: 60%+
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For a weak acid HA with a degree of dissociation x, which of the following gives the correct expression for \((\text{pH} - \text{pKa})\)?
| 1. | log (1+2x) | 2. | \(\log \left(\dfrac{1-x}{x}\right)\) |
| 3. | 0 | 4. | \(\log \left(\dfrac{x}{1-x}\right)\) |
Subtopic: Ionisation Constant of Acid, Base & Salt |
61%
Level 2: 60%+
JEE
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