Advertisements
Advertisements
प्रश्न
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric acid and concentrated nitric acid would you choose? Explain why you would not use the acids you reject.
उत्तर
Dilute sulphuric acid.
Conc. nitric acid, even in its diluted form, is not used in the preparation of hydrogen from metals because it is a powerful oxidising agent and oxygen formed due to its decomposition oxidises hydrogen to give water, thus defeating the purpose of the reaction.
Conc. sulphuric acid is not used in the preparation of hydrogen as it will produce sulphur dioxide.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
FILL IN THE BLANK
In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
Which metal is preferred for the preparation of hydrogen?
from water?
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Complete and balance the following reaction.
Mg + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
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]
Give a balanced equation for obtaining hydrogen from?
Steam using a trivalent metal
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{MgO + H2}\]
