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प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
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उत्तर
Hydrogen is lighter than air.
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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.
FILL IN THE BLANK
........................... means ‘maker of water’ in Greek.
TRUE \ FALSE
reacts with hot water to form copper oxide and hydrogen.
Hydrogen gas is collected by the downward displacement of water. Give reason ?
Why are the following metals not used in the lab preparation of hydrogen?
calcium
Starting from hydrogen gas how would you obtain a neutral liquid.
Complete and balance the equation:
[General method]
Reactions of metals - alkali [conc. soln.]
Zinc - Zn + 2NaOH → ______ + _______ [g]
Zn + 2KOH → ____ + _____ [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.
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
Give a balanced equation for the following conversion.
\[\ce{MgCl2<-HCl->FeCl2}\]
