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.$#

Pine_and_fir_are_difficult_to_brighten._Colour_reduction_occurs_by_alt

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‚Äö√Ñ√∂‚àö√ë‚àö¬®_and_reduce_any_residual_peroxide.$#
A.	Chromosome
B.	Chromophoric
C.	Dithionite
D.	Peroxide
Answer» C. Dithionite

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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.
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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; __________

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.$#

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