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प्रश्न
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Potassium- K + H2O → ______+ ______ [g]
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उत्तर
\[\ce{2K + 2H2O -> 2KOH + H2}\] [g]
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संबंधित प्रश्न
Hydrogen gas is collected by the downward displacement of water. Give reason ?
Why hot concentrated sulphuric acid is not used in the preparation of hydrogen?
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Correct the following statement:
Hydrogen is separated from CO by passing the mixture through caustic potash solution.
State how hydrogen occurs in the free state. Name three compounds containing hydrogen in the combined state.
Select the correct options for the following statement:
A metal which reacts with water to give a metallic hydroxide & liberate hydrogen.
Complete and balance the equation:
[General method]
Reactions of metals with steam
Zinc - Zn + H2O → ______+ _______ [g]
Account for the following fact:
Potassium and sodium are not used to react with dilute ‘hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
Give a balanced equation for the following conversion.
\[\ce{KAlO2<-KOH->K2ZnO2}\]
