| 1 |
A chemical reaction A ---------- B is said to be in equilibrium when |
- A. Complete conversion of A to B has taken place
- B. Conversion of A to B is 50% complete
- C. Rate of transformation of A to B is equal to B to A
- D. 50% Reactant have been changed to B
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| 2 |
When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium. |
- A. Forward
- B. Reverse
- C. Neither forward nor reverse
- D. Equally move in both direction
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| 3 |
When small amount of acid or base is added to buffer, its pH. |
- A. Remain same
- B. Always increases
- C. Always decreases
- D. slightly increases or decreases
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| 4 |
The number of moles of acid or base required by one dm<sup>3</sup>of buffer to alter its pH by one unit is called |
- A. Buffer efficiency
- B. Buffer capacity
- C. Buffer action
- D. None
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| 5 |
The unit of equilibrium constant K<sub>c</sub>for the reaction |
- A. dm<sup>+6</sup>mole<sup>-2</sup>
- B. mole<sup>2</sup>dm<sup>-6</sup>
- C. Mole dm<sup>-3</sup>
- D. Having no units
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| 6 |
When solid KI dissolved in water, its heat of solution is positive. What would happen to dissolution when temperature is increased. |
- A. Increases
- B. Decreases
- C. Remain same
- D. Firs increases than decreases
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| 7 |
One dm3 of a buffer solution containing 0.01 M NH4Cl and 0.1 M NH4OH having pKa of 3 has pH. |
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| 8 |
For which system does the equilibrium constant K<sub>c</sub>has units of (concentration)<sup>-1</sup> |
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| 9 |
Buffer action can be explained by |
- A. Common ion effect
- B. Law of mass action
- C. Le Chateller's principle
- D. All above
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| 10 |
When HCl is added to H2S aqueous solution, Its ionization |
- A. Decrease
- B. Increase
- C. Remains constant
- D. First increases than decreases
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