1)with relevant equation suggest three methods of preparing hydrogen using the following zinc, acidified water,6v battery, dilute Hydrochloric acid, Red hot iron, steam2)why did Mendeleev left some gaps in his periodic table? give example for such gaps

1)with relevant equation suggest three methods of preparing hydrogen u

1.	1)with relevant equation suggest three methods of preparing hydrogen using the following zinc, acidified water,6v battery, dilute Hydrochloric acid, Red hot iron, steam2)why did Mendeleev left some gaps in his periodic table? give example for such gaps
Answer» MENDELEEV left some gaps in his periodic table because he BELIEVED that in FUTURE more elements will be discoveredExplanation:mark me as brain LIST

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1)with relevant equation suggest three methods of preparing hydrogen using the following zinc, acidified water,6v battery, dilute Hydrochloric acid, Red hot iron, steam2)why did Mendeleev left some gaps in his periodic table? give example for such gaps​

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1)with relevant equation suggest three methods of preparing hydrogen using the following zinc, acidified water,6v battery, dilute Hydrochloric acid, Red hot iron, steam2)why did Mendeleev left some gaps in his periodic table? give example for such gaps