Metallurgy Mock Tests

18 questions available

Metallurgy Mock Test 1

Questions: 18

Sample Questions

EAPCET Chemistry

In the Ellingham diagram, why does the line for the reaction 2C + O₂ → 2CO have a negative slope?

A Catalyst is used

B Increase in number of gas molecules

C Reaction is exothermic

D Decrease in entropy

EAPCET Chemistry

In the Hall-Heroult process for aluminium extraction, which role does cryolite (Na₃AlF₆) play?

A It acts as an oxidising agent

B It lowers the melting point of the mixture and increases conductivity

C It oxidises aluminium to Al³⁺

D It acts as a reducing agent for alumina

EAPCET Chemistry

In the extraction of aluminium, bauxite is purified by dissolving in concentrated NaOH. This process is based on:

A Amphoteric nature of Al2O3

B Acidic nature of Al2O3

C Reducing nature of Al2O3

D Basic nature of Al2O3

EAPCET Chemistry

The ore that contains both iron and copper is:

A Bauxite

B Copper pyrites (CuFeS2)

C Magnetite

D Haematite

EAPCET Chemistry

In froth floatation process, why do sulphide ores preferentially attach to air bubbles while gangue particles remain in the water?

A Sulphide ores are lighter than gangue

B Sulphide ores are hydrophobic and rendered more so by pine oil, while gangue is hydrophilic

C Sulphide ores are magnetic and gangue is non-magnetic

D Sulphide ores dissolve in water and gangue does not

EAPCET Chemistry

In the Ellingham diagram, if the ΔG° line of metal M₁ lies below that of metal M₂, then:___SEQ___38

A M₁ can reduce the oxide of M₂

B M₂ can reduce the oxide of M₁

C Neither can reduce the other's oxide

D Both form oxides spontaneously

EAPCET Chemistry

According to the Ellingham diagram, which of the following reducing agents can reduce Cu₂O to Cu at temperatures below 1000 K?

A C (carbon)

B CO (carbon monoxide)

C Al (aluminium)

D H₂ (hydrogen)

EAPCET Chemistry

In the Hall-Heroult process for aluminium extraction, what is the role of Na₃AlF₆ (cryolite)?

A It acts as an oxidising agent

B It lowers the melting point of Al₂O₃ and increases conductivity

C It oxidises carbon anodes

D It removes iron impurities

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