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प्रश्न
‘Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.’ Give reasons.
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उत्तर
Magnesium reacts with dil. HNO3 at low temperature liberating H2, since oxidizing action of dil. HNO3 is much reduced due to dilution.
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संबंधित प्रश्न
A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
Write an equation for the reaction.
Hydrogen is obtained by displacement from:
- dilute sulphuric acid
- dilute hydrochloric acid
Write equations using zinc and iron.
Why does copper not show similar behavior?
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.
Metal in the powdered form reacts very slowly with boiling water, but it decomposes in steam. Name the metal.
What do you observe when hydrogen gas is passed through a soap solution?
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.
Using dilute sulphuric acid how would you differentiate between:
Copper and magnesium
How would you identify the gaseous products evolved.
Using dilute sulphuric acid how would you differentiate between:
Sodium sulphide and sodium carbonate.
How would you identify the gaseous products evolved.
State why hydrogen is not prepared in the laboratory by the action of lead with dilute hydrochloric acid.
Name the following.
The salt formed when aluminium reacts with potassium hydroxide, during the preparation of hydrogen from alkalis.
