The concentration of ion in a solution containing 0.1 M HCN and 0.2 M NaCN will be:
( for HCN = )
1. 3.1
2.
3.
4.
1. | Equilibrium is possible only in a closed system at a constant temperature. |
2. | All measurable properties of the system remain constant. |
3. | All the physical processes stop at equilibrium. |
4. | The opposing processes occur at the same rate and there is a dynamic but stable condition. |
The salt solution that is basic in nature is:
1. Ammonium chloride.
2. Ammonium sulphate.
3. Ammonium nitrate.
4. Sodium acetate.
1. H3O+ and H2F+, respectively.
2. OH– and H2F+, respectively.
3. H3O+ and F–, respectively.
4. OH– and F–, respectively.
pH of a saturated solution of is 9. The solubility product of is:
1.
2.
3.
4.
Which composition will make the basic buffer?
1. | 100 mL of 0.1 M HCl+100 mL of 0.1 M NaOH |
2. | 50 mL of 0.1 M NaOH+25 mL of 0.1 M CH3COOH |
3. | 100 mL of 0.1 M CH3COOH+100 mL of 0.1 M NaOH |
4. | 100 mL of 0.1 M HCl+200 mL of 0.1 M NH4OH |
The following equilibrium constants are given:
N2 + 3H2 ⇌ 2NH3; K1
N2 + O2 ⇌ 2NO; K2
H2 + 1/2O2 ⇌ H2O; K3
The equilibrium constant for the oxidation of NH3 by oxygen to give NO is:
1.
2.
3.
4.
In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10. pH of the buffer solution is:
1. | 10 | 2. | 7 |
3. | 6 | 4. | 4 |
The value of for the reaction is less than zero. Formation of will be favoured at:
1. Low pressure and low temperature
2. High temperature and low pressure
3. High pressure and low temperature
4. High temperature and high pressure
At 25 ºC, the dissociation constant of a base, BOH, is 1.0 × 10–12. The concentration of hydroxyl ions in 0.01M aqueous solution of the base would be:
1. | 1.0 × 10–6 mole L–1 | 2. | 1.0 × 10–7 mole L–1 |
3. | 2.0 × 10–6 mole L–1 | 4. | 1.0 × 10–5 mole L–1 |