Tag: principles of metallurgy

Questions Related to principles of metallurgy

Bayer's process is used for the concentration of ______ ore.

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. aluminium

  2. zinc

  3. copper

  4. iron

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Correct Option: A
Explanation:

Bayer's process is used for the concentration of aluminium ore, bauxite. In this process, the impurities like iron oxide and silica are removed.

Enrichment of ore is also known as:

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. concentration of ore

  2. ore dressing

  3. both $A$ and $B$

  4. none of the above

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Correct Option: C
Explanation:

Concentration of ore is also k/a enrichment of ore or one dressing. All the method depend on some difference in physical or chemical properties of gangue.

In Bayer's process, the crushed ore is treated with ______ .

chemistry principles of metallurgy concentration of ore concentration of ores general principles of metallurgy

  1. hot concentrated caustic soda (NaOH)

  2. cold dilute caustic soda (NaOH)

  3. hot concentrated caustic potash (KOH)

  4. cold dilute caustic potash (KOH)

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Correct Option: A
Explanation:

Bayer's process is the industrial refining process to refine bauxite to produce alumina. In this process, the crushed ore is treated with hot concentrated caustic soda (NaOH).

Baking powder has one of the following constituents, which is:

chemistry principles and processes of isolation of elements concentration of ore concentration of ores principles of metallurgy

  1. $Na _{2}CO _{3}$

  2. $Na _{2}SO _{4}$

  3. $KHCO _{3}$

  4. $NaHCO _{3}$

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Correct Option: D
Explanation:

Sodium bicarbonate, also called sodium hydrogen carbonate, or bicarbonate of soda, $NaHCO _3$, is a source of carbon dioxide and so is used as an ingredient in baking powders, in effervescent salts and beverages, and as the main constituent of dry-chemical fire extinguishers. Its slight alkalinity.

Which of the following is not an ore -

chemistry principles and processes of isolation of elements concentration of ore concentration of ores principles of metallurgy

  1. Malachite

  2. Calamine

  3. Stellite

  4. Cerussite

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Correct Option: C
Explanation:

Stellite is an alloy of Co, Cr, W & F and is extremely hard, which is used in drill bits for rock drilling.

Chemical separation is one of the methods employed in _________.

chemistry principles and processes of isolation of elements concentration of ore concentration of ores principles of metallurgy

  1. concentration of ore

  2. extraction of metal from its oxide

  3. conversion of ore to oxide

  4. none of the above

Show answer
Correct Option: A
Explanation:

Chemical separation is one of the methods employed in concentration of ore.