October 2021 1 14 Report
Укажите группу веществ, которая содержит только кислородосодержащие двухосновные кислоты:


HNO2, H2SO3, H2SiO3


H2CO3, H2SO4, H2SiO3


H2SeO3, HNO2, HNO3


H2S, H2Se, H2SO4
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