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14. The considerations during the extraction of metals by electrochemical method are :

a) Reactivity of metals: If the metals are reactive and are likely to react with water then the metals should be isolated by the electrolysis of their purified molten ore rather than their aqueous solution.

b) Suitability of electrodes:The electrode is carefully chosen so that they should not react with the product of electrolysis. If they react then the electrodes must be made of a material which is quite cheap so their replacement should not increase the cost of the process.

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Note: The abovementioned information is as per official sources. However, it is subject to change. Hence, it is indicative.

34. Option (iv) 5 is correct since silicon is doped with a pentavalent substance like Phosphorus or Arsenic so, four out of five electrons are used in the formation of four covalent bonds with four of its neighbouring silicon atoms. The fifth electron is extra and becomes delocalised. These delocalised electrons increase the conductivity of doped silicon. 

Both SRM University and Amrita Vishwa Vidyapeetham Coimbatore are good options to pursue an MBA. However, in terms of affordability, SRM University is more affordable since the tuition fees to pursue an MBA at SRM University is INR 2 lakh, and the tuition fee to pursue an MBA at Amrita Vishwa Vidyapeetham Coimbatore is INR 12 lakh.

Note: The fee mentioned above is as per the official sources. However, it is indicative and subject to change.

33. Option (ii) neutral is correct since p-type semiconductor mainly contains positively charged carriers ( holes ) which are able to move freely. It is still considered to be neutral as the fixed acceptor atoms having accepted electrons are negative. 

To know which is a better choice, students must weigh both options based on important factors such as fees and ratings. As per official sources, the fees to pursue an MBA at SRM University and Amrita Vishwa Vidyapeetham Coimbatore is INR 2 Lacs and INR 12 lakh, respectively. In terms of fees, SRM University is a better choice.

Moreover, as per Shiksha ratings, SRM University and Amrita Vishwa Vidyapeetham Coimbatore have been rated 4.2 out of 5 and 4.2 out of 5, respectively. In terms of rating, both universities stand in the same position.

Note: The above information is taken from various official sources. Hence, it is indicative.

12. Sulfide ore of copper contains some types of impurities. Sulfide ores are not reduced easily, but oxide ores are easily reduced. It is necessary to make sulfide ores free from volatile impurities. This can be performed by a roasting method. In this moisture escape and impurities like sulfur, phosphorus, arsenic are oxidized to their volatile oxides. It is performed in a reverberatory furnace. After this process the mass becomes porous.

32. Option (ii) equal number of cations and anions are missing from the lattice is correct since Schottky defect in crystals occurs when equal numbers of cations and anions are missing from the lattice.

31. Option (i) Frenkel defect is correct since it is a type of defect in which an atom is dislocated from its lattice position to an interstitial site. 

10. Sulfide ores are not reduced easily, but oxide ores are easily reduced. Sulfide ore of copper contains some types of impurities. This can cause by-product formation and degrade our final product. Iron oxide is present as a key impurity of concern in sulfide ore of copper. During the roasting process the temperature in the furnace is near about 1200°C. During such high temperatures iron oxide which is gangue (impurity) in ore forms slag. Slag is insoluble in molten metal and being lighter floats over the surface of molten metal. Here silica is used as flux.

FeO + SiO₂ →FeSiO₃ 

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30. Option (iv) ionic solid is correct since in graphite each atom is linked to the other through a covalent bond and hence it is a covalent solid and cannot fall under the category of ionic solid. 

29. Option (iii) electron is correct since lattice sites can only be occupied by electrons when there is imperfection in a solid and do not occur in pure crystals. Hence, the lattice site in a pure crystal cannot be occupied by electrons.

The fee structure for BSc courses at GTU Ahmedabad includes several components, such as tuition fee, admission fee, application fee, hostel fee, etc. The tuition fee for BSc courses is INR 13,125 per semester, and the university offers separate hostels for boys and girls available on campus. The university allocates the hostel rooms on the basis of candidates' merit. The fee amount mentioned is sourced from the official website/sanctioning body and is subject to change. Therefore, it is indicative. 

28. Option (iv) CrO₂ is correct since it shows electrical conductivity similar to the metals. 

27. Option (iii) TiO₃  is correct since certain metal oxides such as VO, VO₂, VO₃and TiO₃  show either metallic or insulating properties depending upon the temperature.