Осуществить цепочки превращений
1)Na2CO3 → NaCl → Na → NaI → NaNO3 → Na2CrO4
2)Na → NaOH → Na → NaI → NaBr → NaCl
3)K → KOH → K2CO3 → KCl → KNO3 → KNO2 → →KNO3 → KNO2 → K2SO4
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