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 |
At 25°C, the pH of a solution containing 0.10 M sodium acetate and 0.03 M acetic acid will be:
[pKa value of ]
1. 3.24
2. 4.59
3. 5.09
4. 6.67
The ratio of the concentration of salt and acid for preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid will be: (Ka=10-5)
1. 1:10
2. 10:1
3. 100:1
4. 1:100
The pH of a solution made by mixing 50 mL of 0.01 M barium hydroxide solution with 50 mL of H2O is
1. | 3.0 | 2. | 6.0 |
3. | 12.0 | 4. | 15.0 |