MCQOPTIONS
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MCQOPTIONS
This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Pulp & Paper Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Pine and fir are difficult to brighten. Colour reduction occurs by altering __________ groups, the pulp is sometimes subsequently treated with SO2 to neutralize OH– and reduce any residual peroxide. |
| A. | a)Chromosome |
| B. | b)Chromophoric |
| C. | c)Dithionite |
| D. | d)Peroxide |
| Answer» C. c)Dithionite | |
| 2. |
__________ with sodium hydroxide and/or sodium peroxide is utilized to produce the high pH that is crucial to produce the active perhydroxyl ion, HOO–. |
| A. | a)Hydrogen dioxide |
| B. | b)Hydrogen peroxide |
| C. | c)Hydrogen silicate |
| D. | d)Hydrogen fluoride |
| Answer» D. d)Hydrogen fluoride | |
| 3. |
__________ (5% on wood) is used usually after the addition of magnesium ion. The mechanism for inactivating the ions by __________ precipitating the ions, but, strictly speaking, it is not a chelating agent. |
| A. | a)Sodium disulfate |
| B. | b)Sodium peroxide |
| C. | c)Sodium silicate |
| D. | d)Sodium hydroxide |
| Answer» D. d)Sodium hydroxide | |
| 4. |
Chelating agents, such as __________ have the added gain of preventing pulp dis-coloration by binding together with ferric ion that could otherwise form a colored complex with the phenolic lignin structure. |
| A. | a)Pulp |
| B. | b)Lignin |
| C. | c)Oxygen |
| D. | d)EDTA |
| Answer» E. | |
| 5. |
In hydrosufite bleching Zn+2SO2andrarr; __________ |
| A. | a)ZnSO |
| B. | b)Zn S2O4 |
| C. | c)Zn2SO4 |
| D. | d)ZnS2O4 |
| Answer» C. c)Zn2SO4 | |