Tag: geography

Quizzes (501) Questions (6412)

Questions Related to geography

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Which of the following statements is correct regarding the slag formation during extraction of a metal like copper or iron?

  1. The slag is lighter and lower melting than the metal.

  2. The slag is heavier and lower melting than the metal.

  3. The slag is lighter and higher melting than the metal.

  4. The slag is heavier and higher melting than the metal.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Slag formed in extraction of metals are lighter and having low melting point than metal so they generally appear in upper layer of solutions.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

The combined state of metals are called:

  1. Mineral

  2. Gangue

  3. Flux

  4. Native form
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The metal found in nature occur in the free or combined state it is generally known as pure metals. A native metal is a metal found in metallic state naturally.  It can be in the pure form or in the form of an alloy.


$Mineral:$  Minerals are substances that are formed naturally in the earth.  Minerals are usually solid, inorganic, have a crystal structure, and are formed naturally by geological process.


$Gangue:$ It is sand, rock and other impurities surrounding the minerals of interest in an ore. It is the combined state of the metal.

$Flux:$ It is a chemical cleaning, flowing or purifying agent.  It is the substance added to the molten metals to bond with impurities that can be removed.

$Native form:$ Native element, any number of chemical elements that may occur in nature uncombined with other elements.


Hence, the correct option is B.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Sulphide ores are common for metals:

  1. Ag, Cu and Pb

  2. Ag, Cu and Sn

  3. Ag, Mg and Pb

  4. none
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  1. Argentite $Ag _2S$
  2.  Galena $PbS$
  3.  Chalcocite $Cu _2S$
  4.  Copper pyrite (chalco pyrite)$ [CuFeS _2]$
  5.  Cassiiterite $SnO _2$
  6.  Dolomite  [$ Ca Mg (CO _3) _2$]
  7.  Bauxite $Al(OH) _3$

∴ Sulphide containing ores are$ Ag, Cu, Pb.$


Option A is correct.

Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

The process(es) by which lighter earthy particles are freed from the heavier particles using water is/are:

  1. Gravity separation

  2. Levigation

  3. Hydraulic washing

  4. Leaching
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

During concentration of ores, lighter earthy particles are freed from the heavier particles using water. This is carried out by gravity separation or hydraulic washing or levigation.
During leaching, the soluble material is extracted from insoluble material by dissolving out in a suitable solvent.