Question

Write following reactions in the form of balanced chemical equation.

(i) Heating manganese dioxide with aluminium powder.

(ii) Reaction of iron with water vapour.​

Answer 1

Explanation:

(i) Calcium metal reacts with water-

(Calcium)

Ca

+

(Water)

2H

2

O

⟶Ca(OH)

2

+H

2

(ii) Cinnabar is heated in the presence of air-

(Cinnabar)

HgS

+

(Air)

3O

2

−2SO

2

2HgO⟶2Hg+O

2

(iii) Manganese dioxide is heated with aluminium powder-

(Mnganese dioxide)

3MnO

2

+

(Aluminium powder)

4Al

⟶3Mn+2Al

2

O

3

Answer 2

Question: What are the chemical equations for reactions taking place when manganese dioxide is heated with aluminium powder? Answer: 3MnO2 + 4Al ----> 3Mn + 2Al2O3 Aluminium powder is a reducing agent. These displacement reactions are so exothermic that the metals are produced in the molten state.


Isy