Advertisements
Advertisements
Question
Account for the following fact:
Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilutes sulphuric acid.
Advertisements
Solution
Pb (lead) is above hydrogen in reactivity series. With dil. HCl, Pb forms PbCl2 and with dil. H2SO4, Pb forms PbSO4 both PbCl2 and PbSO4 are insoluble and forms a respective coating to stop the further reaction.
RELATED QUESTIONS
Hydrogen is ______ than air.
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Which metal is preferred for the preparation of hydrogen?
from water?
Why nitric acid is not used in the preparation of hydrogen?
Where does hydrogen occur in a free state?
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
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?
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
Name the electrode –
- through which the current enters the electrolyte.
- at which hydrogen is liberated.
Select the correct options for the following statement:
The metal which reacts with steam liberating hydrogen & the reaction is reversible.
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
