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प्रश्न
For laboratory preparation of hydrogen, give the following:
materials used
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उत्तर
Granulated zinc, dilute HCl or dil. H2SO4
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ...................soluble in water.
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 acid?
Which test should be made before collecting hydrogen in a gas jar?
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.
Zn + NaOH →_____________ +___________
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.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Aluminium - 2Al + 3H2O → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
Give a reason for the following.
Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.
