Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 37

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In the leaching method, bauxite ore is digested with a concentrated solution of $N a O H$ that produces $' X' .$ When $C O_{2}$ gas is passed through the aqueous solution of $' X',$ a hydrated compound $' Y'$ is precipitated. $' X'$ and $' Y'$ respectively are.

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Important Questions on General Principles and Processes of Isolation of Metals (Metallurgy)

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 38

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 39

The ore that contains both iron and copper is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 41

Hall Heroult's process is given by:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 43

The reaction that does not define calcination is

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 44

In the Hall-Heroult process, aluminium is formed at the cathode. The cathode is made out of:

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-3>Q 45

The pair that does

NOT

Require calcination is :

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 1

For given processes, choose the correct order of purity of silicon obtained.

I

.

{SiO}_{2} + 2 C ⟶ Si + 2 CO

II

.

Si (pure) + 2 {Cl}_{2} ⟶ {SiCl}_{4}

{SiCl}_{4} + 2 Mg \to Si + {MgCl}_{2}

III

.

{Na}_{2} [{SiF}_{6}] + 4 Na ⟶ 6 NaF + Si ⟶ Zone

refined

Si

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Alpha Question Bank for Engineering: Chemistry>Chapter 18 - General Principles and Processes of Isolation of Metals (Metallurgy)>Exercise-4>Q 2

The rocky and silicious matter associated with an ore is called: