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प्रश्न
Why are the following metals not used in the lab preparation of hydrogen?
calcium
उत्तर
Calcium is expensive.
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
FILL IN THE BLANK
In electrolysis of water, dilute sulphuric acid is added to increase ..................of water.
For laboratory preparation of hydrogen, give the following:
materials used
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?
Why are the following metals not used in the lab. preparation of hydrogen?
aluminium
Starting from hydrogen gas how would you obtain a metal by reduction of its heated oxide.
Select the correct options for the following statement:
The metal used as a catalyst in hydrogenation of oils.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Aluminium - 2Al + 3H2O → ______+ _______ [g]
State the condition and give balanced equation for the conversion of water gas to hydrogen – in the Bosch process.
