- 1(current)
Q. No.When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink
\(\small{\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}(\text {Pink})\left(\mathrm{aq})+4 \mathrm{Cl}^{-}(\mathrm{aq}) \rightleftharpoons\left[\mathrm{CoCl}_4\right]^{2-}(\text {Blue})(\mathrm{aq})+6 \mathrm{H}_2 \mathrm{O}(\mathrm{l})\right.}\)
On the basis of the information given above, mark the correct answer:
| 1. | ∆ H > 0 for the reaction |
| 2. | ∆ H < 0 for the reaction |
| 3. | ∆ H = 0 for the reaction |
| 4. | The sign of ∆ H cannot be predicted on the basis of the given information. |
On increasing the pressure, the direction in which the gas phase reaction proceeds to re-establish equilibrium is predicted by applying Le-Chatelier's principle. Consider the reaction,
Which of the following is correct, if the total pressure at which the equilibrium is established is increased without changing the temperature?
| 1. | K will remain the same. |
| 2. | K will decrease. |
| 3. | K will increase. |
| 4. | K will increase initially and then decrease, when pressure is very high. |
The addition of a small amount of argon at a constant volume will not affect the equilibrium of the following reaction:
| 1. | H2(g)+I2(g)⇌2HI(g) |
| 2. | PCl5(g)⇌ PCl3(g)+Cl2(g) |
| 3. | N2(g)+3H2(g)⇌2NH3(g) |
| 4. | The equilibrium will remain unaffected in all the three cases. |
- 1(current)
Q. No.
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