The mixture that can act like a buffer is:
1.
2.
3.
4. All of the above
An acid buffer solution can be prepared by mixing the solutions of:
1. Sodium chloride and sodium hydroxide
2. Sulphuric acid and sodium sulphate
3. Ammonium chloride and ammonium nitrate
4. Ammonium acetate and acetic acid
A buffer solution can be prepared from a mixture of:
I. Sodium acetate and acetic acid in water
II. Sodium acetate and hydrochloric acid in water
III. Ammonia and ammonium chloride in water
IV. Ammonia and sodium hydroxide in water.
1. I, III, IV
2. III, IV
3. I, II, IV
4. I, III
Conjugate base of hydrazoic acid is:
1. \({HN_3}^-\)
2. \(N_2^-\)
3. \(N_3^-\)
4. \({N^3}^-\)
The pH of 0.1 M solution of the following compounds increases in the order of -
1.
2.
3.
4.
The pKa of HCN is 9.30. The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up the total volume to 500 ml will be:
1. | 9.30 | 2. | 8.30 |
3. | 7.30 | 4. | 10.30 |
Which of the following is an example of a reversible reaction?
1. | \(\small{KNO_3(aq) + NaCl(aq) \rightleftharpoons KCl(aq) + NaNO_3(aq)} \) |
2. | \(\small{2Na(s) + H_2O(l) \rightleftharpoons 2NaOH(aq) + H_2(g)} \) |
3. | \(\small{AgNO_3(aq) + NaCl(aq) \rightleftharpoons AgCl(s) + NaNO_3(aq)} \) |
4. | \(\small{Pb{(NO_3)}_2(aq) + 2NaI(aq) \rightleftharpoons PbI_2(s) + 2NaNO_3(aq)} \) |
If a solution of 0.1 M NH4OH and 0.1 M NH4Cl has pH 9.25, then the pKb of NH4OH will be:
1. | 9.25 | 2. | 4.75 |
3. | 3.75 | 4. | 8.25 |