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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
Complete the following word equation:
Calcium + water → calcium hydroxide + _________
Hydrogen can be prepared with the metal zinc by using:
acid
Give an equation.
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.
Choose the correct option:
Hydrogen is evolved by the action of cold dil. HNO3 on
Select the odd one out and justify your answer.
SO2, H2S, NH3, and CO3
Select the odd one out and justify your answer.
Fe, Pb, Al and Zn
Correct the following statement:
Very dilute nitric acid reacts with iron to produce hydrogen.
What do you observe when dilute sulphuric acid is added to Zinc granules.
Using dilute sulphuric acid how would you differentiate between:
Copper and magnesium
How would you identify the gaseous products evolved.
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
