- 1(current)
Q. No.Match the following equilibria with the corresponding condition.
| A. LiquidVapour | 1. Saturated solution |
| B. SolidLiquid | 2. Boiling point |
| C. SolidVapour | 3. Sublimation point |
| D. Solute (s)Solute (solution) | 4. Melting point |
| 5. Unsaturated solution |
Codes
| A | B | C | D | |
| 1. | 2 | 4 | 3 | 1 |
| 2. | 1 | 2 | 3 | 5 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
An incorrect statement about equilibrium among the following is:
| 1. | Equilibrium is possible only in a closed system at a given temperature. |
| 2. | All measurable properties of the system remain constant. |
| 3. | All the physical processes stop at equilibrium. |
| 4. | The opposing processes occur at the same rate and there is a dynamic but stable condition. |
An incorrect statement about equilibrium among the following is:
| 1. | In equilibrium mixture of ice and water kept in perfectly insulated flask, the mass of ice and water does not change with time. |
| 2. | The intensity of the red colour increases when oxalic acid is added to a solution containing iron (III) nitrate and potassium thiocyanate. |
| 3. | On the addition of a catalyst, the equilibrium constant value is not affected. |
| 4. | The equilibrium constant for a reaction with a negative ∆H value decreases as the temperature increases. |
are the respective ionisation constants for the following reactions.
\(\mathrm{H}_2 \mathrm{~S} \rightleftharpoons \mathrm{H}^{+}+\mathrm{HS}^{-}\)
\(\mathrm{HS}^{-} \rightleftharpoons \mathrm{H}^{+}+\mathrm{S}^{2-}\)
\(\mathrm{H}_2 \mathrm{~S} \rightleftharpoons 2 \mathrm{H}^{+}+\mathrm{S}^{2-}\)
The correct relationship between is:
| 1. | \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1} \times \mathrm{K}_{\mathrm{a}_2} \) | 2. | \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1}+\mathrm{K}_{\mathrm{a}_2} \) |
| 3. | \(K_{a_3}=K_{a_1}-K_{a_2} \) | 4. | \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1} / \mathrm{K}_{\mathrm{a}_2}\) |
At a particular temperature and atmospheric pressure, the solid and liquid
phases of a pure substance can exist in equilibrium. Choose the terms
which define this temperature.
(a) Normal melting point
(b) Equilibrium temperature
(c) Boiling point
(d) Freezing point
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
- 1(current)
Q. No.
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