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

Identify the ore not containing iron.

  1. Limonite

  2. Siderite

  3. Carnelite

  4. Chalcopyrites
Reveal answer Fill a bubble to check yourself
C,D Correct answer
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.
Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

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

  1. carbohydrate

  2. protein

  3. haemoglobin

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Flux

  2. Slag

  3. Gangue

  4. Ore
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  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
Reveal answer Fill a bubble to check yourself
A,B Correct answer
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.$SnO _2+2C \Rightarrow Sn+2C$.

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

Which of the following compounds are not called Thomas slag?

  1. Calcium silicate

  2. Calcium phosphate

  3. Barium phosphate

  4. Strontium silicate
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation
Calcium phosphate($Ca _3(PO _4) _2O)$ is called Thomas slag and remaining calcium silicate, barium phosphate and strontium silicate are not Thomas slag.

Hence options A,C & D are correct.
Multiple choice geography in the land of kerala introduction to metallurgy occurrence of metals study of kerala

Composition of azurite mineral is:

  1. $CuCO _3.CuO$
  2. $Cu(HCO _3) _2.Cu(OH) _2$
  3. $2CuCO _3.Cu(OH) _2$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Azurite is one of the basic copper (II) carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula $Cu(CO _3) _2(OH) _2$ with the copper (II) cations linked to two different anions, carbonate and hydroxide.

Hence the composition of azurite mineral is $2CuCO _3.Cu (OH) _2$

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

${Ca _3(PO _4) _2}$ is :-

  1. Thomas slag

  2. Used in cement manufacturing

  3. Used in manufacturing of phosphorus fertilizer

  4. Used as a refactory material
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

${Ca _3(PO _4) _2}$ is called as Thomas slag and is used in cement manufacturing and manufacturing of phosphorus fertilizer,so options A,B & C are correct stetements.
Options A,B & C  are correct.