Tag: principles of metallurgy

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Questions Related to principles of metallurgy

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

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

  1. hot concentrated caustic soda (NaOH)

  2. cold dilute caustic soda (NaOH)

  3. hot concentrated caustic potash (KOH)

  4. cold dilute caustic potash (KOH)
Reveal answer Fill a bubble to check yourself
A Correct answer
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).

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

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

  1. $Na _{2}CO _{3}$
  2. $Na _{2}SO _{4}$
  3. $KHCO _{3}$
  4. $NaHCO _{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
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.