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प्रश्न
What do you observe when hydrogen gas is passed through a soap solution?
उत्तर
On passing hydrogen gas through soap solution, soap bubbles filled with hydrogen fly high and burst. This behavior proves that hydrogen is lighter than air.
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संबंधित प्रश्न
From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from dilute HCl.
Hydrogen can be prepared with the metal zinc by using:
acid
Give an equation.
Give an equation to express the reaction between:
Calcium and water
A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
What do you observe when a few drops of red litmus solution are added to the turbid solution.
Thin strips of magnesium, copper, and iron are taken.
Write down what happens when these metals are treated as follows:
- Heated in presence of air
- Heated with dil.HCl
- Added to an aqueous solution of zinc sulphate.
Thin strips of magnesium, copper, and iron are taken.
Arrange these metals in descending order of reactivity.
Select the odd one out and justify your answer.
Fe, Zn, Cu and Mg
Correct the following statement:
Conc. H2SO4 reacts with zinc to liberate hydrogen.
What do you observe when dilute sulphuric acid is added to Zinc granules.
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
