MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If the pH of a substance is given by 3 then what is the pOH of the substance? |
| A. | 3 |
| B. | 7 |
| C. | 14 |
| D. | 11 |
| Answer» E. | |
| 2. |
Note that the pKa here is given by 4.752, a buffer is made using 0.8 M acetic acid and 1 M Sodium Acetate what do you think its pH is(log10/8 = 0.097)? |
| A. | 4.84 |
| B. | 4.85 |
| C. | 4.849 |
| D. | 4.846 |
| Answer» C. 4.849 | |
| 3. |
If 0.20 mol/L CH3COOH and 0.50 mol/L CH3COO together make a buffer solution, calculate the pH of the solution if the acid dissociation constant of CH3COOH is 1.8 10-5. |
| A. | 2.09 |
| B. | 5.14 |
| C. | 2.65 |
| D. | 3.98 |
| Answer» C. 2.65 | |
| 4. |
Buffer capacity of a buffer is given as two units for a change in pH by Unity. Then what is the number of moles of acid or base, added in one litre of the solution? |
| A. | 2 |
| B. | 0.5 |
| C. | 1 |
| D. | 4 |
| Answer» B. 0.5 | |
| 5. |
What is the buffer capacity if 3 moles are added in 5 litres of the solution to change the pH by 2 units? |
| A. | 0.2 |
| B. | 0.5 |
| C. | 0.15 |
| D. | 0.3 |
| Answer» E. | |
| 6. |
Buffer solution is destroyed when _____________ |
| A. | addition of weak base |
| B. | addition of strong acid or base |
| C. | addition of weak acid |
| D. | addition of a salt |
| Answer» B. addition of strong acid or base | |
| 7. |
Which of the following is an equation used to calculate the pH of a buffer solution for an acidic buffer? |
| A. | pH = pK<sub>a</sub> + log[salt]/[acid] |
| B. | pOH = pK<sub>a</sub> + log[salt]/[acid] |
| C. | pH = pK<sub>b</sub> + log[salt]/[acid] |
| D. | pH = pK<sub>a</sub> + log[salt][acid] |
| Answer» B. pOH = pK<sub>a</sub> + log[salt]/[acid] | |
| 8. |
Which of the following is not an acidic buffer? |
| A. | Acetic Acid-Sodium acetate |
| B. | Boric acid-borax |
| C. | Ammonium hydroxide-ammonium chloride |
| D. | All are acidic buffers |
| Answer» D. All are acidic buffers | |
| 9. |
Carbonic acid and sodium bicarbonate are present in blood as a buffer. |
| A. | true |
| B. | false |
| Answer» B. false | |