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प्रश्न
Give reason for the following:
Purified and dried hydrogen is collected over mercury.
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उत्तर
Purified and dried hydrogen is collected over mercury because mercury has no reaction with it.
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संबंधित प्रश्न
A metal ______ hydrogen in the reactivity series gives hydrogen with ______.
Give reason for the following:
Though hydrogen is lighter than air it cannot be collected by downward displacement of air.
MULTIPLE CHOICE QUESTIONS
Hydrogen burns in oxygen to form
- hydrogen sulphide
- nitrates
- water
- ammonia
Hydrogen gas is collected by the downward displacement of water. Give reason ?
Which test should be made before collecting hydrogen in a gas jar?
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A monovalent metal
Correct the following statement:
Hydrogen is separated from CO by passing the mixture through caustic potash solution.
Complete and balance the equation:
[General method]
Reactions of metals with dilute acids
Aluminium - 2Al + 3H2SO4 → ______+ _______ [g]
How did the name ‘hydrogen’ originate? How does hydrogen occur in the combined state?
State the reactant added to hydrogen to obtain the respective product in following case.
Hydrogen sulphide
