I.Какое вещество лишнее и укажите почему.
1) Na; Mg; S; Cu …………………………………………………
2) P; C; Si; K ……………………………………………………...
3) Cu; Li; Na; K …………………………………………………….
4) P; H2; O2; N2……………………………………………………..
5) CO2; SO3; Ca(OH)2 ; P2O5……………………………………….
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