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Bаsed оn the clаssificаtiоn оf matter: Both Helium gas and MgCl2 solid are [answer1]. Helium and Magnesium are an [answer2] and MgCl2 solid is a [answer3]. But MgCl2 solution is a [answer4] element: gas: heterogeneous mixture: homogenous mixture: liquid: pure compound: pure substance(s): solid: solution: