Tag: introduction to metallurgy

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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.

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

Which of the following mixture can be separated by magnetic separation?

  1. Iron filings, sand and iodine

  2. Common salt, sand and marbles

  3. Chalk powder, grain and chaff

  4. Stone, salt and water
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
For option A, the iron filling can be removed by using a magnet. an iron filling will be attracted by a magnet while water and iodine will not.

For option B, marbles can be separated by hand. Now add water salt will dissolve while sand will not. then separate the saltwater and sand.

For option C, winnowing can be used to separate chaff and grains.for chalk powder we can use filtration.

For option D, stone can be removed by handpicking, now water and salt can be separated by boiling the water. so water will evaporate leaving salt behind.
Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Match the following:


(i) Biodegradable polymer (p) 3-Hydroxybutanoic acid
(ii) Bakelite (q) Phenol
(iii) Neoprene (r) 2-chlorobuta-1, 3-diene
(iv) Glyptal (s) phthalic acid

  1. $i - p, ii - q, iii - r, iv - s$
  2. $i - q, ii - p, iii - r, iv - s$
  3. $i - p, ii - q, iii - s, iv - r$
  4. $i - s, ii - r, iii - p, iv - q$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i) PHBV (3-Hydroxybutanoic acid + 4-Hydroxypentanoic acid) is a biodegradable polymer. 


(ii) Bakelite is synthesized from the monomer Phenol & Formaldehyde

(iii)  2-chlorobuta-1,3-diene is the monomer of Neoprene.

 
(iv) Glyptal is synthesized from the condensation polymerization of Phthalic acid & Ethylene glycol.

Hence, the correct option is $\text{A}$

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

A tin chloride $Q$ undergoes the following reaction (not balanced)
$Q + Cl^{-} \rightarrow X$
$Q + Me _{3}N \rightarrow Y$
$Q + CuCl _{2}\rightarrow Z + CuCl$
$X$ is monoanion having pyramidal geometry. Both $Y$ and $Z$ are neutral compounds. Choose the correct options(s)

  1. The central atom in $X$ is $sp^{3}$ hybridized
  2. There is a coordinate bond in $Y$
  3. The oxidation state of the central atom in $Z$ is $+2$
  4. The central atom in $Z$ has one lone pair of electrons
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

$\underset {(P)}{SnCl _{2}} + Cl^{-} \rightarrow \underset {(X)}{SnCl _{3}^{-}}$
$\underset {(P)}{SnCl _{2}} + Me _{3}N \rightarrow \underset {(Y)}{SnCl _{2} [N(CH _{3}) _{3}]}$
$\underset {(P)}{SnCl _{2}} + 2CuCl _{2}\rightarrow \underset {(Z)}{SnCl _{4}} + CuCl$.