~--The preparation of the nitro derivatives of the hydrocarbons of the benzene series is very simple. [Please select]
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There are also tri-nitro and tetra-nitro and [alpha] and [beta] derivatives of nitro-naphthalene. [Please select]
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We import and consume 500,000 pounds of opium yearly, when 70,000 pounds, including its derivatives and preparations, should suffice for our medical needs. [Please select]
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There is first the group of eosine dyes, which are acid derivatives of a colour-base, and, in virtue of being so, will combine with the metallic oxides. [Please select]
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