# Questions with detailed step by step solutions from Hydrogen

##### Questions in Hydrogen
1. The scientist who has established the elementary character of hydrogen is
2. In the laboratory preparation of hydrogen, the hydrogen gas formed is collected by the downward displacement of water because
3. The density of hydrogen is
4. When hydrogen is passed under the pressure at $200{}^\text{o}C$ through vegetable oils in the presence of a catalyst Nickel, the reaction is called
5. When hydrogen is passed under the pressure at $200{}^\text{o}C$ through vegetable oils in the presence of a catalyst Nickel, it forms:
6. The mixture of hydrogen and oxygen on burning produces heat up to $2800{}^\text{o}C$ . This is called oxy-hydrogen flame. The application of this flame is
7. Hydrogen acts as a reducing agent, in the following reaction which of the substance gets reduced. $PbO+~{{H}_{2}}~\to Pb+{{H}_{2}}O$
8. Oxidation is
9. Reduction is
10. Hydrogen has a very important property of combining with nitrogen at $450{}^\text{o}C$ and in the presence of catalyst iron, the gas formed is