Brightening of mechanical pulps is done by reducing agents like ______

1.	Brightening of mechanical pulps is done by reducing agents like __________
A.	Groundwood
B.	Sulphite
C.	Dithionite
D.	Dissolving pulp
Answer» D. Dissolving pulp

Discussion

No Comment Found

Related MCQs

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; __________

Brightening of mechanical pulps is done by reducing agents like __________

Discussion

No Comment Found

Related MCQs

Reply to Comment