Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium

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Solution

(d) aluminium
There are some metals that cannot be satisfactorily reduced by carbon. In such cases, aluminium is used as reducing agent, e.g., manganese.

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Q. Match the entries of column- I with appropriate entries of column- II

Column-I (Metal to be extracted)	Column-II (Method used for reduction of oxide)
(A) Iron or Zinc	(i) Reduction with aluminium
(B) Manganese or Chromium	(ii) Reduction with Carbon
(C) Mercury	(iii) Electrolytic reduction
(D) Aluminium	(iv) Reduction of heating alone

The two metals which are extracted by means of electrolytic reduction of their molten salt are:
(a) magnesium and manganese (b) iron and aluminium
(c) zinc and magnesium (d) magnesium and aluminium

Q. Which one of the methods given in column- I is applied for the extraction of the metal given in column II:

Column -I	Column - II
(A) Electrolytic reduction	(i) Aluminium
(B) Reduction with carbon	(ii) Zinc
(C) Reduction with aluminium	(iii) Sodium
	(iv) Iron
	(v) Manganese
	(vi) Chromium

Name one metal each which is extracted by:
(a) reduction with carbon. (b) electrolytic reduction.
(c) reduction with aluminium (d) reduction with heat alone.

Q. How is manganese extracted from manganese dioxide, MnO₂? Explain with the help of an equation.

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Manganese metal is extracted from manganese dioxide by a reduction process by making use of: (a) carbon (b) hydrogen (c) electrolysis (d) aluminium

(d) aluminium There are some metals that cannot be satisfactorily reduced by carbon. In such cases, aluminium is used as reducing agent, e.g., manganese.

Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium

(d) aluminium
There are some metals that cannot be satisfactorily reduced by carbon. In such cases, aluminium is used as reducing agent, e.g., manganese.