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प्रश्न
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.
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उत्तर
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.
संबंधित प्रश्न
Name the following:
Two metals which give hydrogen with cold water.
How do different metals displace hydrogen from water? Explain with the help of equations.
Complete the following word equation:
Sodium hydroxide + zinc → hydrogen + _________
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
Choose the correct option:
Elements which show unique nature in the preparation of hydrogen are:
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
Complete and balance the following reaction.
Zn + H2O →_____________ +___________
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Calcium - Ca + H2O → ______+ _______ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{Fe3O4 + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
