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प्रश्न
Where does hydrogen occur in a free state?
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उत्तर
In the free state, hydrogen is found in traces in the earth's crust and atmosphere. Volcanic gases contain 0.025%, the earth's crust 0.98%, the earth's atmosphere 0.01% and the atmosphere of the Sun and stars 1.1%.
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संबंधित प्रश्न
Fill in the blank
Hydrogen reacts with metal oxides to form ............and....................
Name the following:
Two metals which give hydrogen with cold water.
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Which metal is preferred for the preparation of hydrogen?
from water?
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
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?
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Complete and balance the following reaction.
Al + KOH + H2O→_____________ +___________
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
A white substance which leaves an amphoteric oxide as a residue [whose colour varies in the heated and in the cold state] and evolves a gas which turns lime water milky.
State the reactant added to hydrogen to obtain the respective product in following case.
Ammonia
