15 + Mcqs in Bleaching Mechanical Pulps Page 1 McqOptions

Explore topic-wise MCQs in Pulp Paper.

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.

__________ with sodium hydroxide and/or sodium peroxide is utilized to produce the high pH that is crucial to produce the active perhydroxyl ion, HOO–.

(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.

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.

In hydrosufite bleching Zn+2SO2andrarr; __________

___________WITH_SODIUM_HYDROXIDE_AND/OR_SODIUM_PEROXIDE_IS_UTILIZED_TO_PRODUCE_THE_HIGH_PH_THAT_IS_CRUCIAL_TO_PRODUCE_THE_ACTIVE_PERHYDROXYL_ION,_HOO‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬®.?$#

Pine_and_fir_are_difficult_to_brighten._Colour_reduction_occurs_by_altering____________groups,_the_pulp_is_sometimes_subsequently_treated_with_SO2_to_neutralize_OH‚Äö√Ñ√∂‚àö√ë‚àö¬®_and_reduce_any_residual_peroxide.$#

(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?

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.

In hydrosufite bleching Zn+2SO2andrarr; __________

__________ (a common name in the industry, but dithionite is the preferred name) bleaching process is carried out with 0.5-1.0% dithionite on the wood.

Brightened mechanical pulps are the ones subjected to colour reversion. Since the lignin is largely decoloured, but not removed, there is only a small loss of yield.

Brightening of mechanical pulps is done by reducing agents like __________

Mechanical pulps are bleached with chemicals just to alter many of the chromophores.

__________ are most, sometimes conjugated double bond systems arising in the lignin of pulps.

Explore topic-wise MCQs in Pulp Paper.

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.

__________ with sodium hydroxide and/or sodium peroxide is utilized to produce the high pH that is crucial to produce the active perhydroxyl ion, HOO–.

__________ (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.

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.

In hydrosufite bleching Zn+2SO2andrarr; __________

___________WITH_SODIUM_HYDROXIDE_AND/OR_SODIUM_PEROXIDE_IS_UTILIZED_TO_PRODUCE_THE_HIGH_PH_THAT_IS_CRUCIAL_TO_PRODUCE_THE_ACTIVE_PERHYDROXYL_ION,_HOO‚ÄÖ√Ñ√∂‚ÀÖ√Ë‚ÀÖ¬®.?$#

Pine_and_fir_are_difficult_to_brighten._Colour_reduction_occurs_by_altering____________groups,_the_pulp_is_sometimes_subsequently_treated_with_SO2_to_neutralize_OH‚Äö√Ñ√∂‚àö√ë‚àö¬®_and_reduce_any_residual_peroxide.$#

__________ (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?

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.

In hydrosufite bleching Zn+2SO2andrarr; __________

__________ (a common name in the industry, but dithionite is the preferred name) bleaching process is carried out with 0.5-1.0% dithionite on the wood.

Brightened mechanical pulps are the ones subjected to colour reversion. Since the lignin is largely decoloured, but not removed, there is only a small loss of yield.

Brightening of mechanical pulps is done by reducing agents like __________

Mechanical pulps are bleached with chemicals just to alter many of the chromophores.

__________ are most, sometimes conjugated double bond systems arising in the lignin of pulps.

(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.

(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?