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प्रश्न
Helium is preferred to hydrogen for filling balloons because it is:
विकल्प
lighter than air
almost as light as hydrogen
non-combustible
inflammable
उत्तर
non-combustible
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संबंधित प्रश्न
Give an equation to express the reaction between:
Steam and red hot iron
Which metal is preferred for collecting hydrogen from Cold water? Write the balanced equation.
Based on the reactions of water on metals, arrange the following metals in increasing order of reactivity: iron, sodium, magnesium, zinc, calcium
Give reason for the following:
Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
Give a reason for the following.
Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.
Select the odd one out and justify your answer.
Zn, Fe, Mg, and Na
Correct the following statement:
Conc. H2SO4 reacts with zinc to liberate hydrogen.
Give a chemical test to distinguish between the following gases:
Hydrogen chloride and hydrogen sulphide
Using dilute sulphuric acid how would you differentiate between:
Sodium sulphide and sodium carbonate.
How would you identify the gaseous products evolved.
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
