| 1 |
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
|
| 2 |
Which one of the following aqueous solutions has the highest pH |
- A. 0.1 M NaOH
- B. 0.1 M HCl
- C. 0.2 M H2SO4
- D. 0.1 M HNO3
|
| 3 |
Le-Chatelier Braun principle is sometimes known as |
- A. Law of mass action
- B. Law of mobile equilibrium
- C. Law of active mass
- D. All of these above
|
| 4 |
The pK<sub>a</sub>value of CH<sub>3</sub>COOH is 4.74 when we mix CH<sub>3</sub>COOH and CH<sub>3</sub>COONa in the ratio of 10:1, tehn the pH of the buffer is |
- A. 4.74
- B. 5.74
- C. 3.74
- D. 7.00
|
| 5 |
A solution have H+ ions concentration 1 x 10<sup>-7</sup> , its pH will |
- A. Acidic
- B. Basic
- C. Neutral
- D. Zero
|
| 6 |
_________ was derived by C.M Guldberg and P Waage in 1864 |
- A. Law of conservation of Mass
- B. Law of mass action
- C. Law of conservation of energy
- D. Distribution law
|
| 7 |
The effect of temperature on equilibrium was studied by |
- A. Lewis
- B. Van der wall
- C. Arrhenius
- D. Vant hoff
|
| 8 |
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
|
| 9 |
A buffer solution can be prepared by mixing |
- A. Weak acid and its salt with weak base
- B. Weak base and its salt with strong acid
- C. Strong acid and its salts with weak base
- D. Strong base and its salt with weak acid
|
| 10 |
the substance which increase the rate of reaction but remains unchanged at the end of the reaction is called. |
- A. Indicator
- B. Promoter
- C. Catalyst
- D. Activated complex
|