Q. No.(Given: 10-5.30 = \(5.0 \times 10^{-6}\))
1. 1.1 × 10-4
2. 5.0 × 10-6
3. 2.0 × 10-9
4. 5.6 × 10-10
What is the pH of a solution obtained by mixing 50 mL of water with 50 mL of a 1×10-3 M barium hydroxide solution?
1. 3.0
2. 3.3
3. 11.0
4. 11.7
Consider the following statements:
| I. | Ionic product of water KW cannot change with temperature. |
| II. | The value of the equilibrium constant is independent of the initial concentration of the reactant and products. |
| III. | The equilibrium constant for an exothermic reaction decreases as the temperature increases. |
Which of the above statements is true?
1. I and II only
2. I and III only
3. II and III only
4. I, II, and III
For the reaction, A
| 1. | 102 | 2. | 103 |
| 3. | 104 | 4. | 10 |
Cu(OH)2(s) + 4 NH3(aq) \(\leftrightharpoons\) Cu(NH3)42+(aq) + 2 OH¯(aq)
| 1. | Keq = \(\dfrac{[Cu(NH_3)_4^{2+}][OH^-]}{[NH_3]}\) |
| 2. | Keq = \(\dfrac{[Cu(NH_3)_4^{2+}][2~OH^-]}{[4~NH_3]}\) |
| 3. | Keq = \(\dfrac{[Cu(NH_3)_4^{2+}][OH^-]^2}{[NH_3]^4}\) |
| 4. | Keq = \(\dfrac{[Cu(NH_3)_4^{2+}][2~OH^-]^2}{[4~NH_3]^4}\) |
A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of is 0.20 M. If the equilibrium constant, Kb for NH3 equals 1.8×10–5, then what is the pH of this solution?
(log 1.8 = 0.25; log 0.67 = –0.176)
1. 9.43
2. 11.72
3. 8.73
4. 9.08
An aqueous solution of NaOH has a concentration of 0.01 mol/L.
Calculate the pH of the NaOH solution at 25 °C.
Given the ionic product of water is Kw = [H+] [OH–] = 10–14 mol2/L2 (at 25 °C)
1. 11
2. 7
3. 14
4. 12
(Given: molar mass of Sr = 88 g/mol; log 40 =1.60 ; and log 122 = 2.086)
1. 13.51
2. 0.48
3. 10.22
4. 11.25
\(H_2NCOONH_4 (s) \rightleftharpoons2 NH_3(g) + CO_2(g)\), the total pressure at equilibrium is 15 atmospheres. It can be concluded that the value of \(K_P\) will be:
1. 15 atm3
2. 50 atm3
3. 500 atm3
4. 100 atm3
\(N_2(g) + 3H_2 (g) \rightleftharpoons 2NH_3(g) \), on adding inert gas at constant volume, equilibrium:
| 1. | shifts in the forward reaction |
| 2. | shifts in backward reaction |
| 3. | remains unaffected |
| 4. | Initially in the forward direction and then in the backward direction |
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