Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
- On heating thin strips of magnesium, copper, and iron, they form oxides.
- Magnesium and iron react with HCl liberating hydrogen and forming their respective salts. Hydrogen cannot be prepared from metals that are below it in the activity series of metals (such as copper) because only metals that are more reactive than hydrogen can displace it from acids.
- Only magnesium will displace zinc from zinc sulphate solution because magnesium is more reactive than zinc in the activity series of metals. No reaction takes place in the case of copper and iron because they are less reactive than zinc.
APPEARS IN
संबंधित प्रश्न
Write a balanced equation for the following:
Iron reacts with dil. HCl
Complete the following word equation:
Calcium + water → calcium hydroxide + _________
A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed.
Name the gas formed in the reaction. How would you test the gas?
Choose the correct option:
Hydrogen is evolved by the action of cold dil. HNO3 on
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.
Select the odd one out and justify your answer.
Zn, Fe, Mg, and Na
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.
Name the following.
A metal below iron but above copper in the activity series of metals which has no reaction with water.
