Advertisements
Advertisements
प्रश्न
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
उत्तर
- In free state : In traces in the earth’s crust and atmosphere and in volcanic gases. It is also found in huge amount in the interior of the sun.
- In combined state : In organic compounds, plant and animals, in acids, in water.
APPEARS IN
संबंधित प्रश्न
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
TRUE \ FALSE
Hydrogen does not combine with nitrogen under ordinary conditions.
What is noticed if the products are not allowed to escape?
Complete and balance the following reaction.
Mg + H2O →_____________ +___________
Complete and balance the following reaction.
Fe + H2O →_____________ +___________
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Zinc - Zn + H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals with steam
Iron - 3Fe + 4H2O ⇌ ______+ _______ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{MgO + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Fe3O4 + H2}\]
