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Class 12 Chemistry Metallurgy General Principles and Processes of Isolation of Elements

Carbon reduction process is not commercially applicable for which of the following set of oxides to extract the respective metal?

(I)

Z n O

(II)

F e_{2} O_{3}

(III)

A l_{2} O_{3}

(IV)

S n O_{2}

(V)

M g O

(a)

Z n O, F e_{2} O_{3}, S n O_{2}

(b)

Z n O, S n O_{2}, M g O

(c)

M g O, A l_{2} O_{3}

(d)

M g O, S n O_{2}, A l_{2} O_{3}

,

Correct answer: (c)

Solution: Carbon reduction process is used to reduce less electropositive metals.

M g

and

A l

have high electropositivity.

M g O + C a t h i g h t e m p 200 0^{0} C M g + C O

It is possible at high temperatures, so it is not used for commercial purposes.

Hence, cannot be extracted from oxides through the carbon reduction process.

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general principles and processes of isolation of elements

metallurgical operations

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general principles and processes of isolation of elements

metallurgical operations

Select the correct statement.

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Which of the given metal oxides is having minimum thermal decomposition temperature?

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The diagram shows the changes in state of water (

H_{2} O

). What is the process X called :

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Match items of Column I with the items of Column II and assign the correct code with respect to Column I:

	Column I		Column II
(a)	Cyanide process	(i)	Ultrapure $G e$
(b)	Froth floatation process	(ii)	Dressing of $Z n S$
(c)	Electrolytic reduction	(iii)	Extraction of $A l$
(d)	Zone refining	(iv)	Extraction of $A u$
		(v)	Purification of $N i$

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Described the thermodynamic principle of metallurgy. How the Ellingham diagram useful in predicting the feasibility of thermal reduction of a metal oxide.

play button image

To make the following reduction process spontaneous, temperature should be

Z n O + C ⟶ Z N + C O

play button image

Choose the correct option of temperature at which carbon reduces FeO to iron and produces CO.

play button image

At temperatures above 1073 K coke can be used to reduce FeO to Fe. How can you justify this reduction with Ellingham diagram?

play button image

Select the correct statement.

play button image

Which of the given metal oxides is having minimum thermal decomposition temperature?

play button image

The diagram shows the changes in state of water (

H_{2} O

). What is the process X called :

play button image

Match items of Column I with the items of Column II and assign the correct code with respect to Column I:

	Column I		Column II
(a)	Cyanide process	(i)	Ultrapure $G e$
(b)	Froth floatation process	(ii)	Dressing of $Z n S$
(c)	Electrolytic reduction	(iii)	Extraction of $A l$
(d)	Zone refining	(iv)	Extraction of $A u$
		(v)	Purification of $N i$

play button image

Described the thermodynamic principle of metallurgy. How the Ellingham diagram useful in predicting the feasibility of thermal reduction of a metal oxide.

play button image

To make the following reduction process spontaneous, temperature should be

Z n O + C ⟶ Z N + C O

play button image

Choose the correct option of temperature at which carbon reduces FeO to iron and produces CO.

play button image

At temperatures above 1073 K coke can be used to reduce FeO to Fe. How can you justify this reduction with Ellingham diagram?

play button image

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Copyright FILO EDTECH PVT. LTD. 2021