Which of the following alternatives best describes the reaction A ⇌ B at its halfway point?
1. | \(\Delta G^{\ominus}=0\) | 2. | \(\Delta G^{\ominus}>0\) |
3. | \(\Delta G^{\ominus}<0\) | 4. | \(\Delta G^{\ominus}=-RTlnK\) |
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. |
At 500 K, equilibrium constant, Kc, for the following reaction is 5.
What would be the equilibrium constant Kc for the reaction?
1. 0.04
2. 0.4
3. 25
4. 2.5
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. |
for is and Kb for is . The pH of ammonium acetate will be:
1. 7.005
2. 4.75
3. 7.0
4. Between 6 and 7
The value of the pH of \(0.01 \) \(\text{mol dm}^{-3} \)\(\text{CH}_3\text{COOH}\) \(\left(K_a=1.74 \times 10^{-5}\right)\) is:
1. | 3.4 | 2. | 3.6 |
3. | 3.9 | 4. | 3.0 |
Among the following solvents, silver chloride is most soluble in:
1. solution
2. solution
3.
4. Aqueous ammonia
The mixture that will produce a buffer solution when mixed in equal volumes is:
1. | 0.1 mol dm-3 NH4OH and 0.1 mol dm-3 HCl |
2. | 0.05 mol dm-3 NH4OH and 0.1 mol dm-3 HCl |
3. | 0.1 mol dm-3 NH4OH and 0.05 mol dm-3 HCl |
4. | 0.1 mol dm-3 CH3COONa and 0.1 mol dm-3 NaOH |
Acidity of BF3 can be explained on the basis of:
1. Arrhenius concept
2. Bronsted Lowry concept
3. Lewis concept
4. Bronsted Lowry as well as Lewis concept
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. | \(\mathrm{K}_{\mathrm{a}_3}=\mathrm{K}_{\mathrm{a}_1} / \mathrm{K}_{\mathrm{a}_2}\) |