Q. No.The first ionization constant of H2S is 9.1 × 10–8. The concentration of HS– ion in its 0.1 M solution will be:
1.
12.3 × 10–7 M
2.
11.4 × 10–6 M
3.
3.5 × 10–4 M
4.
9.54 × 10–5 M
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The ionization constant of acetic acid is \(1.74 × 10^{–5}.\) The pH of acetic acid in its 0.05 M solution will be:
1. 7.81
2. 3.03
3. 8.54
4. 1.45
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The ionization constant of propanoic acid is 1.32 × 10–5. The degree of ionization of 0.05M acid solution will be:
1. = 0.63 × 10–2
2. = 1.63 × 10–4
3. = 1.63 × 10–2
4. = 0.05 × 10–2
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The equilibrium constant Kc expression for the above mentioned reaction is:
| 1. | \(\mathrm{K_{C} = \dfrac{\left[IF_{5}\right]^{2}}{\left[F_{2}\right]^{5}}}\) | 2. | \(\mathrm{K_{C} = \dfrac{\left[IF_{5}\right]^{2}}{\left[F_{2}\right]^{5} \left[I_{2}\right]}}\) |
| 3. | \(\mathrm{K_{C} = \dfrac{\left[F_{2}\right]^{5} \left[I_{2}\right]}{\left[IF_{2}\right]^{2}}}\) | 4. | \(\mathrm{K_{C} = \dfrac{\left[F_{2}\right]^{5}}{\left[IF_{5}\right]^{2}}}\) |
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The species described below that contain Lewis acids are:
OH– , F– , H+ and BCl3
| 1. | BCl3 and F–
|
2. | OH– and F–
|
| 3. | H+and BCl3
|
4. | F– and BF3 |
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1. \(\mathrm{HSO}_4^{-}, \mathrm{CO}_3^{2-}\)
2. \(\mathrm{HSO}_4^{-}, \mathrm{CO}_3^{-}\)
3. \(\mathrm{SO}_4^{2-}, \mathrm{CO}_3{ }^{2-}\)
4. \(\mathrm{HS}_2 \mathrm{O}_4{ }^{-}, \mathrm{CO}_3{ }^{2-}\)
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For the given reaction:
PCl5 (g) PCl3 (g) + Cl2 (g), ∆rH° = 124.0 kJ mol–1 and Kc = 8.3 10-3 mol L-1 at 473 K
The effect on Kc if (i) pressure is increased and (ii) the temperature is increased will be, respectively-
1. (i) Will increase; (ii) will decrease
2. (i) Will decrease; (ii) will remain the same
3. (i) Will remain the same; (ii) will increase
4. (i) will remain the same; (ii) Will decrease
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(a) PCl5 (g) PCl3 (g) + Cl2 (g)
(b) CaO (s) + CO2 (g) CaCO3 (s)
(c) 3Fe (s) + 4H2O (g) Fe3O4 (s) + 4H2 (g)
The effect of an increase in the volume on the number of moles of products in the above-mentioned reactions would be, respectively:
1. a) Increase, b) decrease, c) same
2. a) Decrease, b) same, c) increase
3. a) Increase, b) increase, c) same
4. a) Increase, b) decrease, c) increase
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What is the molarity of the standard solution if the solubility product for a salt of type AB is ?
1.
2.
3.
4.
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