Question

Hg+H2SO4---->HgSO4+NAOH---->Hg(OH)2---->HgO+H2---->HG
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Answer 1

CuSO4+HCl→; Hg+H2SO4(конц)→; Cu+HCl→; NaNO3+HCl→; MgCl2+H2SO4(конц)→; NaSO3+H2SO4→; NaOH+H2SO4→; Al(OH)3+H2SO4→