Advertisements
Advertisements
प्रश्न
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
उत्तर
2K + 2H2O →2KOH + H2
APPEARS IN
संबंधित प्रश्न
Name the following:
Two metals which give hydrogen with cold water.
For laboratory preparation of hydrogen, give the following:
materials used
Why nitric acid is not used in the preparation of hydrogen?
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?
sodium
Select the correct options for the following statement:
The metallic compound formed when a metal above aluminium in the activity series reacts with steam.
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.
An efflorescent substance which leaves a residue having the same colour as the substance and evolves a gas which changes the colour of cobalt chloride paper.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
State the reactant added to hydrogen to obtain the respective product in following case.
Ammonia
Give a balanced equation for the following conversion.
\[\ce{ZnO<-H2O->Fe3O4}\]
