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प्रश्न
Name an element whsich reacts violently with water at room temperature.
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उत्तर
Element reacts with water violently at room temperature is potassium.
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संबंधित प्रश्न
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:
chemical equation
Give reason for the following:
The end of the thistle funnel should be dipped under acid.
‘Hydrogen is obtained by electrolysis of acidified water’.
Answer the following pertaining to the preparation of hydrogen by electrolysis,
The meaning of the term ‘electrolysis’ and ‘electrolyte’.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Aluminium - 2Al + 3H2SO4 → ______+ _______ [g]
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Aluminium - 2Al + 2NaOH + 2H2O → ______ + _______ [g]
2Al + 2KOH + 2H2O → _____ + _____ [g]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{MgO + H2}\]
Select the correct answer to the reactant added, to give the product in the preparation of hydrogen gas.
\[\ce{NaAlO2 + H2}\]
Give a balanced equation for the following conversion.
\[\ce{KAlO2<-KOH->K2ZnO2}\]
