Tag: in the land of kerala

Questions Related to in the land of kerala

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

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

  1. Gravity separation

  2. Levigation

  3. Hydraulic washing

  4. Leaching

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Correct Option: A,B,C
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.

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

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

  1. Iron filings, sand and iodine

  2. Common salt, sand and marbles

  3. Chalk powder, grain and chaff

  4. Stone, salt and water

Show answer
Correct Option: A
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.

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

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

  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. $i - s, ii - r, iii - p, iv - q$

Show answer
Correct Option: A
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 $\text{A}$

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)

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

  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

Show answer
Correct Option: A,B
Explanation:

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

Identify the ore not containing iron.

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

  1. Limonite

  2. Siderite

  3. Carnelite

  4. Chalcopyrites

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Correct Option: C,D
Explanation:
Limonite, $Fe _2O _3.3H _2O$ and Silderite, $FeCO _3$ are iron ore.

Carnallite is an evaporite mineral, a hydrated potassium magnesium chloride with formula $KMgCl _3.6H _2O$. 

Chalcopyrite is the most important and major source of copper metal. It is widely spread copper–iron sulphide mineral with chemical formula, $CuFeS _2$.

Thus, Carnelite and chalcopyrite are not the ore of iron.

Hence, option C and D are correct.

Flux is used to remove :

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

  1. Tempering

  2. Annealing

  3. Hardening

  4. Remove the gangue

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Correct Option: D
Explanation:

Flux is used to remove the gangue to form easily fusible slag.
$\underset {flux} {SiO _2} +\underset {gangue} {FeO}\rightarrow \underset {slag} {FeSiO _3}$

Which of the following metals are found in native state?


Ag, Pt, C, Si, N, O, Mg, Na, Pb

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

  1. Ag, Pt, C, N, O

  2. Ag, Pt, Mg

  3. Ag, Pt, Pb, Mg

  4. Ag, Pt

Show answer
Correct Option: D
Explanation:

Ag and Pt are found in native (free) state.
Native silver usually occurs associated with coppr and gold, e.g., in alluvial sands.

CO is toxic because it forms complex with _________ in the blood.

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

  1. carbohydrate

  2. protein

  3. haemoglobin

  4. none of these

Show answer
Correct Option: C
Explanation:

Carbon monoxide binds very strongly to the iron in hemoglobin. Once carbon monoxide attaches, it is very difficult to release. While breathing in carbon monoxide, it sticks to your hemoglobin and takes up all of the oxygen-binding sites. Eventually, blood loses all of its ability to transport oxygen and will cause unconsciousness.

During smelting, an additional substance is added which combines with impurities to form a fusible mass. The additional substance is called__________.

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

  1. Flux

  2. Slag

  3. Gangue

  4. Ore

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Correct Option: A
Explanation:

In the process of smelting, inorganic chlorides, fluorides, limestone and other materials are designated as "fluxes" when added to the contents of a smelting furnace or a cupola for the purpose of purging the metal of chemical impurities such as phosphorus, and of rendering slag more liquid at the smelting temperature.

$SnO _2$ is reduced to metallic Sn on smelting oxide with anthracite and lime. In this, the function of lime is :

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

  1. it acts as a flux

  2. it removes acidic impurities as slag

  3. it removes ,basic impurities as slag

  4. it acts as a slag

Show answer
Correct Option: A,B
Explanation:

In the smelting process the black Sn is mixed with anthracite and little limestone which acts as flux, now this mixture is heated to a degree centigrade of 1200-1300, as a result, $SnO _2$ is reduced to Sn. This crude is having many acid impurities which can be removed as slag.$SnO _2+2C \Rightarrow Sn+2C$.