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प्रश्न
Helium is preferred to hydrogen for filling balloons because it is:
पर्याय
lighter than air
almost as light as hydrogen
non-combustible
inflammable
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उत्तर
non-combustible
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संबंधित प्रश्न
From the knowledge of activity series, name a metal which shows the following properties:
It displaces hydrogen from hot water.
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.
Choose the correct option:
Hydrogen is evolved by the action of cold dil. HNO3 on
Which metal is preferred for collecting hydrogen from:
Write the balanced equation
Hot water
Which metal is preferred for collecting hydrogen from steam? Write the balanced equation for the case.
Select the odd one out and justify your answer.
Fe, Zn, Cu and Mg
Which of the following metals does not give hydrogen with acids?
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
Name the following.
The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis.
