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प्रश्न
Name the following:
Two metals which give hydrogen with cold water.
उत्तर
Sodium (Na) and Potassium (K) give hydrogen with cold water.
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संबंधित प्रश्न
Fill in the blank
Hydrogen is ..................... than air.
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
What is noticed if the products are not allowed to escape?
Hydrogen can be prepared with the help of cold water. Give a reaction of hydrogen with:
A divalent metal
Hydrogen may be prepared in the laboratory by the action of a metal on an acid.
How would you modify your apparatus to collect dry hydrogen? Which drying agent would you employ for this purpose?
Complete and balance the following reaction.
Na + H2O →_____________ +___________
Starting from hydrogen gas how would you obtain a basic gas.
Complete and balance the equation:
[General method]
Reactions of active metals - cold water
Sodium - 2Na + 2H2O → ______+ _______ [g]
Give a balanced equation for obtaining hydrogen from?
Steam using a metal – and the reaction is reversible.
