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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.
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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.
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संबंधित प्रश्न
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In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Zn + HCl →_____________ +___________
Select the correct options for the following statement:
A foul smelling gas formed when hydrogen reacts with a molten non-metal, is ___.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Iron - 3Fe + 4H2O ⇌ ______+ _______ [g]
Name an element whsich reacts violently with water at room temperature.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{MgO + H2}\]
Give a balanced equation for the following conversion.
\[\ce{NH3<-H2->H2S}\]
