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प्रश्न
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
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उत्तर
At first, hydrogen was referred to as an "inflammable gas." It burned in the atmosphere, creating water. Lavoisier gave it the name "hydrogen," which means "water producer," in 1783. [Greek word Hydro = water, gen = producer]
Hydrogen occurs in the combined state:
- Compounds containing hydrogen, along with carbon, oxygen, and nitrogen, make up plant and animal tissues.
- Hydrogen makes up around one-ninth of the mass of water.
- as an ingredient in various substances, such as organic compounds, petroleum products, acids, and alkalis.
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संबंधित प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
Which metal is preferred for the preparation of hydrogen?
from acid?
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Ca + H2O →_____________ +___________
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Zinc - Zn + 2HCl → ______ + _______ [g]
Account for the following fact:
Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Ca(OH)2 + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
Give a balanced equation for the following conversion.
\[\ce{MgCl2<-HCl->FeCl2}\]
