Зачеркни лишнюю формулу

• \(\mathrm{NH\_4Cl}\)
• \(\mathrm{KCl}\)
• \(\mathrm{BaSO\_4}\)
• \(\mathrm{NaHCO\_3}\)
• \(\mathrm{Ba(NO\_3)\_2}\)
• \(\mathrm{Na\_2CO\_3}\)