Advertisements
Advertisements
Question
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
Advertisements
Solution
2K + 2H2O →2KOH + H2
APPEARS IN
RELATED QUESTIONS
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
Name the following:
Two metals which give hydrogen with cold water.
For laboratory preparation of hydrogen, give the following:
fully-labeled diagram
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Where does hydrogen occur in a free state?
Complete and balance the following reaction.
Na + 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.
Complete and balance the equation:
[Industrial Method - Bosch process]
- Step I - Production of water gas -
\[\ce{C + H2O->[1000°C]}\] [____ + ____] - Δ - Step II - Reduction of steam to hydrogen by carbon monoxide
\[\ce{CO + H2 + H2O->[450°C][Fe2O3]}\] _____ + ____ [g] - Step III - Removal of unreacted carbon dioxide and carbon monoxidefrom the above mixture
KOH + CO2 → _________ + ______
CuCl + CO + 2H2O → _______
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
