MCQOPTIONS
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MCQOPTIONS
This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Pulp Paper knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Fill in the blank.pH = pKa + log (CA- / CA) |
| A. | [H+] |
| B. | [HOCl] |
| C. | K1 |
| D. | K2View Answer |
| Answer» C. K1 | |
| 2. |
Fill in the blank.Ka = [H+][Cl–] / [Cl2] = ([H+]3) / (0.091 – [H+]) |
| A. | [H+]. |
| B. | [HOCl] |
| C. | K1 |
| D. | K2View Answer |
| Answer» C. K1 | |
| 3. |
Fill in the blank. |
| A. | [H+]. |
| B. | [HOCl] |
| C. | K1 |
| D. | K2View Answer |
| Answer» B. [HOCl] | |
| 4. |
The hydrolysis of chlorine is also temperature dependent. _________ in Pulping Processes gives the hydrolysis constants of CI2 as a function of temperature; they are 1.45 x 10-4 at 0°C and 9.75 x 10-4 at 60°C. |
| A. | Francis |
| B. | Walter |
| C. | John |
| D. | Rydholm |
| Answer» E. | |
| 5. |
The pH at intermediate amounts of base is given in the form of the _________equation; consequently, the ratio of HOCI to OCl– is not concentration dependent. |
| A. | Henderson-Hasselbalch |
| B. | Kennedy-kraft |
| C. | Jason-Hammer |
| D. | Leigh-Mark |
| Answer» B. Kennedy-kraft | |
| 6. |
An eq. is easily solved at various pH is by utilization of the quadratic eq. At pH = 0, X = 0.00423 M. At pH 1.66, x = 0.0222 in agreement with the calc. above. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7. |
The concentration of Cl in water at 25°Celcius is _________ at saturation (i.e., 1 atmosphere pressure of CI2). |
| A. | 1.254 M |
| B. | 5.324 M |
| C. | 0.091 M |
| D. | 4.542 M |
| Answer» D. 4.542 M | |
| 8. |
The hydrolysis of chlorine is also temperature dependent. _________ in Pulping Processes gives the hydrolysis constants of CI2 as a function of temperature; they are 1.45 x 10-4 at 0°C and 9.75 x 10-4 at 60°C.$ |
| A. | Francis |
| B. | Walter |
| C. | John |
| D. | Rydholm |
| Answer» E. | |
| 9. |
The desired reaction of substitution occurs most rapidly at the _________ pH values; however, acid hydrolysis of cellulose and hemicellulose also increases with decreasing pH. |
| A. | High |
| B. | Slightly above neutral |
| C. | Slightly below neutral |
| D. | Low |
| Answer» E. | |
| 10. |
The pH at intermediate amounts of base is given in the form of the _________equation; consequently, the ratio of HOCI to OCl– is not concentration dependent.$ |
| A. | Henderson-Hasselbalch |
| B. | Kennedy-kraft |
| C. | Jason-Hammer |
| D. | Leigh-Mark |
| Answer» B. Kennedy-kraft | |
| 11. |
An eq. is easily solved at various pH is by utilization of the quadratic eq. At pH = 0, X = 0.00423 M. At pH 1.66, x = 0.0222 in agreement with the calc. above. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
A saturated chlorine solution in water, with addition of acid or base, has a pH of or 1.54, an actual chlorine concentration, Cy, of 0.062 M, a hydrochloric acid concentration of 0.029 M, and HOCl concentration of 0.029. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
The concentration of Cl in water at 25°Celcius is _________ at saturation (i.e., 1 atmosphere pressure of CI2).$ |
| A. | 1.254 M |
| B. | 5.324 M |
| C. | 0.091 M |
| D. | 4.542 M |
| Answer» D. 4.542 M | |
| 14. |
The pH is of utmost importance in _________ for several reasons. First the form of Cl in solution is dependent on the pH according to the following equilibrium reactions. |
| A. | Chlorine bleaching |
| B. | Peroxide bleaching |
| C. | Alovera bleaching |
| D. | Milk bleaching |
| Answer» B. Peroxide bleaching | |