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Chemistry > Metallurgy > Flashcards

Metallurgy Flashcards

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1
Q

Chemical formula of bauxite

A

Al²o³.2H²O

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2
Q

Chemical formula of cryolite

A

Na³ALF⁶

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3
Q

Define calcination

A

The ore is heated in the absence of air

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4
Q

Define roasting

A

The ore is heated in excess of air

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5
Q

What is the function of cryolite used along with Alumina as the electrolyte

A

Lowers the fusion temperature from 250 degree Celsius to 9050 degree Celsius and enhances conductivity

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6
Q

Why is powder Coke sprinkled on top of the electrolyte

A

Reduces heat loss by radiation it prevents burning of anode

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7
Q

The most common ore of iron

A

H a e m a t i t e

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8
Q

For electro refining of copper what is the cathode made up of write the reaction that takes place at the anode

A

It is made up of pure copper metal

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9
Q

Name the components of brass

A

Copper and Zinc

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10
Q

Name the main component of duraluminium

A

Aluminium and copper

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11
Q

Most common ore of the metal aluminium

A

Bauxite

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12
Q

Name the process by which impure over of aluminium gets purified by using concentrated solution of alkali

A

B a e y e r s process

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13
Q

Crushing of ove into fine powder name the process

A

Pulverization

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14
Q

Name the following process of coating zinc on iron

A

Galvanization

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15
Q

An ore of zinc containing it sulphide

A

Zinc blend

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16
Q

A metal oxide that can be reduced by hydrogen

A

Cupric oxide

17
Q

I use for cryolite

A

To reduce melting point

18
Q

One use of fluorospar

A

Making it a good conductor

19
Q

Name the solution used to react with Bauxite a first step in obtaining pure Aluminium oxide in the bae y e r s process

A

Caustic soda NaOH

20
Q

Name the compound added to cure Alumina to lower the fusion temperature during electrolytic reduction of Alumina

A

Cryolite

Chemistry (1 decks)

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