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Fill in the blanks. Conc. H2SO4 chars...

Fill in the blanks.
Conc. `H_2SO_4` chars paper, wood and sugar by removing _________ from them. It is also known as _________. It is manufactured by ______ process. It is a strong __ and __ acid.

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Concentrated `H_2SO_4` acts as strong dehydrating agent. It is also called oil of vitriol, obtained by contact process and is dibasic
A-`H_2O`, B-Oil of vitriol, C-contact , D-oxidising , E-dibasic
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