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 The following reaction occurs in the Blast Furnace where iron ore is reduced to iron metal : Fe2O3(s)+3 CO(g) 2 Fe(l)+3 CO2(g) Using the Le Chatelier’s principle, predict which one of the following will not disturb the equilibrium ?
Option: 1  Removal of CO
Option: 2  Removal of CO2
Option: 3 Addition of CO2
Option: 4 Addition of Fe2O3  
 

\\Fe_{2}O_{3}+3CO \leftrightharpoons 2Fe+3CO \\

According to Le Chatelier's principle change in concentration by changing the amount of reactant or product affect the equilibrium. However, the addition of solid reactant won't affect the concentration.

Therefore, addition of solid Fe2O???3 will not disturb the equilibrium. 

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Posted by

vishal kumar

The ore that contains the metal in the form of fluoride is :
Option: 1 Cryolite
Option: 2 Malachite
Option: 3 Magnetite
Option: 4 Sphalerite
 

The formula of the ores -

1) Cryolite-Na_{3}AlF_{6}

[Contains the metal in the form of fluoride]

2) Malachite-\; CuCO_{3}.Cu\left ( OH \right )_{2}

3) Magnetite-Fe_{3}O_{4}

4) Sphalerite-ZnS

 

So, option 1 is correct.

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Posted by

Ritika Jonwal

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The purest form of commercial iron is:
Option: 1 wrought iron
Option: 2 pig iron
Option: 3 scrap iron and pig iron
Option: 4 cast iron
 

The purest form of iron is wrought iron.

Therefore, Option(1) is correct.

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Posted by

Kuldeep Maurya

Among the reactions (a)  - (d), the reaction(s) that does / do not occur in the blast furnace during the extraction of iron is / are :

(a)  CaO+SiO_{2}\rightarrow CaSiO_{3} (b)  3Fe_{2}O_{3}+CO\rightarrow 2Fe_{3}O_{4}+CO_{2} (c)  FeO+SiO_{2}\rightarrow FeSiO_{3} (d)  FeO\rightarrow Fe+\frac{1}{2}O_{2}
Option: 1 (C) and (D)

Option:2  (A)

Option: 3 (A) and (D)

Option: 4 (D)
 

The following reactions do not occur in the blast furnace:

C) \mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3}

D) \mathrm{FeO} \rightarrow \mathrm{Fe}+\frac{1}{2} \mathrm{O}_{2}

 

Therefore, Option(1) is correct.

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Posted by

vishal kumar

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The refining method used when the metal and the impurities have low and high melting temperatures, respectively is:
Option: 1 vapour phase refining
Option: 2 distillation
Option: 3 liquation
Option: 4 zone refining
 

As we have learnt,

 

Liquation -

In this method, a low melting metal like a tin can be made to flow on a sloping surface. In this way, it is separated from higher melting impurities.

-

Liquation, a technique for separating constituents of ore, a metal or an alloy by partial melting. When the material is heated to a temperature where one of the constituents melts and the other remains solid, the liquid constituent can be drained off. 

 

Therefore, Option(3) is correct.

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Posted by

Ritika Jonwal

The element that can be refind by distillation is :
 
Option: 1 nickel
Option: 2 zinc
Option: 3 tin  
Option: 4 gallium

Impure zinc is refined by the distillation method.

Therefore, the correct option is (2).

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Posted by

Kuldeep Maurya

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The process of the clacination and roasting in metallurigical industries, respectively, can lead to:
Option: 1 Global warming and photochemical smog
Option: 2 Global warming and acid rain
Option: 3 Photochemical smog and ozone layer depletion
Option: 4 Photochemical somg and Global warming 

We know

Calcination Releases → CO2 → Global warming

Roasting Releases → SO2 → Acid Rain

The processes of calcination and roasting in metallurgical industries, respectively, can lead to Global warming and acid rain Due to the industrial processes SO2 gas is released which is responsible for acid rain & CO2 gas for global warming.

Therefore, the correct option is (2).

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Posted by

Kuldeep Maurya

Which one of the following compounds possesses the most acidic hydrogen ?
Option: 1
Option: 2
Option: 3
Option: 4

Among these, Option 2 has the most acidic H, Due to the presence of the 3 (COOR) group. More resonating structure more stability of negative charge.

Therefore, Option(2) is correct.

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Posted by

Kuldeep Maurya

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The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is :
 
Option: 1 Kaolite
Option: 2 Cryolite
Option: 3 Calamine  
Option: 4 Bauxite

Cryolite (Na3AlF6) is added to reduce the melting point of the reaction mixture during the extraction of aluminium.

Therefore, the Correct option is (2)

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Posted by

Kuldeep Maurya

Match List I with List II 
List - I List-II
a. Mercury i. Vapour phase refining
b. copper  ii. Distillation refining 
c. Silicon iii. Electrolytic refining
d. Nickel iv. Zone Refining
 
Option: 1 a-ii, b-iv, c-iii, d-i
Option: 2 a-i, b-iv, c-ii, d-iii
Option: 3 a-ii, b-iii, c-iv, d-i
Option: 4 a-ii, b-iii, c-i, d-iv

We know these - 

(a) Mercury --------> Distillation refining

(b) Copper --------> Electrolytic refining

(c) Silicon --------> Zone refining

(d) Nickel --------> Vapour phase refining.

Therefore, the Correct option is (3)

 

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Posted by

Kuldeep Maurya

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