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Which of following produce gas? 1.CuSo​​​​4 and Zn 2.HCl and Zn 3.CuSo4 and Fe 4.​​​​NaOH and Al

Answer» Which of following produce gas?
1.CuSo​​​​4 and Zn
2.HCl and Zn
3.CuSo4 and Fe
4.​​​​NaOH and Al


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