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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
The answer to each of the following questions is a single digit integer from 0 to 9. If the correct answer to the question number A,B, C and D say 3,0,8,5 respectively, then the correct darkening of bubbles should be as follow. How many of the following metals can be refined by the vapour phase refining? Zr, Zn, Cd, Hg, Ni, Co, Pt, Fe, Ti |
| Answer» Correct Answer - 3 (Three i.e. Zn, Ni, Ti) | |
| 102. |
The answer to each of the following questions is a single digit integer from 0 to 9. If the correct answer to the question number A,B, C and D say 3,0,8,5 respectively, then the correct darkening of bubbles should be as follow. Amonst the following, the total number of ores, which can be concentrated by from floatation process haematite, bauxite, galena, copper pyrites, sphalerite caneterite, calamine, argentite, chalcorite. |
| Answer» Correct Answer - 4 (Four i.e. Galena, copper pyrites, sphalerite, chalcorite). Argerite is a sulphide ore of silver but it is not concentrated by from floation because silver content is low. It is concentrated by leaching with NaCN. | |
| 103. |
Which of the following is used for the seperation of ZnS and PbS during the froth floatation process ?A. KClB. KClC. `NH_(4)NO_3`D. None of these. |
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Answer» Correct Answer - (B) |
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| 104. |
The process by which lighter earthly particles are freed from water is calledA. BeneficationB. LevigationC. LeachingD. None of these |
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Answer» Correct Answer - B Levigation of hydraulic washing is used for the seperation of lighte earthly impurities. |
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| 105. |
Gravity seperation process may be used for the concentration ofA. ChalocopyriteB. BauxiteC. HaematiteD. Calamine |
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Answer» Correct Answer - C Haematite an oxide ore of iron is concentrated by gravity seperation. Copper pyrites a sulphide ore of copper is concentrated by froth floatation method. |
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| 106. |
Extraction of silver from `Ag_(2)S` by the use of sodium cyanide is example ofA. roastingB. hydrometallurgyC. electrometallurgyD. Smelting |
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Answer» Correct Answer - (B) |
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| 107. |
Froth floatation process is used for the concentration ofA. oxide oresB. sulphide oresC. chlorine oresD. amalgams |
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Answer» Correct Answer - (B) |
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| 108. |
Which of the following statements is false ?A. During roasting, moisture is removed from the oreB. The ore is freed from all non metallic impuritiesC. Calcination of ore is carried out in the absence of any blast of airD. The concentrated zinc blende is subjected to calcination during the extraction by pyrometallurgy. |
| Answer» Correct Answer - D | |
| 109. |
Van Arkel method of purification of metals involves converting the metal toA. Volatile compoundB. Volatile unstable compoundC. Non-volatile compoundD. None of these |
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Answer» Correct Answer - A Volatile stable compound. |
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| 110. |
Which of the following pairs of metals is purified by Van Arkel method ?A. Ni and FeB. Ga and InC. Zr and TiD. Ag and Au |
| Answer» Correct Answer - C | |
| 111. |
Zone refining process is used for theA. Concentration of an oreB. Reduction of a metal oxideC. Purification of metalD. Purification of an ore. |
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Answer» Correct Answer - C Zone refining process is used for the purification of a metal. |
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| 112. |
The processing of extracting , metal in pure form fromits ore is known asA. PurificationB. MetallurgyC. RefiningD. Electrolysis |
| Answer» Correct Answer - B | |
| 113. |
Metal which obtained by reduction with carbon isA. FeB. ZnC. PbD. Cu |
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Answer» Correct Answer - D |
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| 114. |
The process of zone refining is used for `:`A. SiliconB. GermaniumC. GalliumD. All the above. |
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Answer» Correct Answer - D Semiconductors such as Si, Ge and Ga are purified by zone refining . |
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| 115. |
The process of zone refining is based uponA. Fractional crystallizationB. Fractional distilllationC. Magnetic properties of impuritiesD. Impurities are less fusible than metals |
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Answer» Correct Answer - A Zone refining is based on difference in solubility of impurities in molten and solid state of the metal or fractional crystallization. |
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| 116. |
Name two metal which are purified by liquation method. |
| Answer» Correct Answer - Lead and tin | |
| 117. |
Leaching is used for the concentration ofA. red bauxiteB. haematiteC. gold oreD. silver ore. |
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Answer» Correct Answer - A::C::D Leaching is used for the concentration of red bauxite , gold ores and silver ores. |
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| 118. |
Ziroconium and titanium are purified byA. ElectrolysisB. Zone refiningC. BessemerisationD. Van-Arkel method |
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Answer» Correct Answer - B Zr and Ti are purified by zone refining. |
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| 119. |
In nature, non metals are found in theA. native stateB. reduced formC. oxidised formD. form of alloys with metals. |
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Answer» Correct Answer - A::B::C In nature , non-metals are found in native state `(N_2, O_2, `C etc .), reduced form (`CH_4, H_2S, NH_3 etc .), oxidised form (`CO_2, H_(2)O` etc.) |
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| 120. |
Tin and lead can be refined byA. CupellationB. LiquationC. PolingD. Bessemerisation |
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Answer» Correct Answer - B Metals , Tin and lead are fusible and hence are refined by liquation. |
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| 121. |
Copper is refined byA. LiquationB. CupellationC. BessemerisationD. Poling |
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Answer» Correct Answer - D Molten impure metal is stired with green wood polls. Wood liberates `CH_4` which reduces any oxides present to the metal. |
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| 122. |
In nature , metals are found in theA. native stateB. oxidised formC. reduced formD. form of alloys. |
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Answer» Correct Answer - A::B In nature metals are not found in reduced form or as alloys. |
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| 123. |
Metal which cannot be refined by electrolytic refining process isA. CuB. CrC. NiD. Al |
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Answer» Correct Answer - B |
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| 124. |
What are silver paint and german silver made of ? |
| Answer» Aluminimum is used for making silver paint. German silver is made from `Cu`, `Zn` and `Ni` (it does not contain silver at all). | |
| 125. |
Heating pyrites to remove sulphur is calledA. SmeltingB. CalcinationC. LiquationD. Roasting |
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Answer» Correct Answer - D Heating pyrites to remove sulphur is called roasting. |
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| 126. |
Heating pyrites in air to remove sulphur dioxide is known asA. CalcinationB. FluxingC. SmelingD. Roasting |
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Answer» Correct Answer - D The ore is roasted in free supply of air to oxidise sulphur to sulphur dioxide. |
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| 127. |
Heating pyrites in air to remove sulphur is known asA. CalcinationB. RoastingC. SmeltingD. Bessimerisatiion |
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Answer» Correct Answer - (B) |
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| 128. |
To which of the following ores , calcination process is not applicableA. `CaCO_3`B. `Al_(2)O_(3).2H_(2)O`C. `CaCO_(3)Ca(OH)_2`D. ZnS |
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Answer» Correct Answer - D In case of ZnS, roasting process and not the calcination is applicable. |
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| 129. |
In roastingA. moisture is removedB. no metal impurties are removedC. all tha above.D. |
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Answer» Correct Answer - D In roasting moisture and non metal impurities are removed and ore becomes porous. |
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| 130. |
The role of calcination in metallurgical operation isA. To remove moistureB. To decompose carbonateC. To derive off organic matter.D. All the above. |
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Answer» Correct Answer - D During calcination, moisture and organic matter are removed, carbonated get decomposed. |
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| 131. |
The major role of fluorpar (`CaF_2` ) which added in small quantities in the electrolyte reduction of alumina dissolved in fused cryolite `(N_(3)AlF_(6)` ) isA. as a catalystB. to make the fused mixture very conducting to lower the temperature of the meltC. to lower the temperature of the meltD. to decrease the rate of oxidation of carbon at anode. |
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Answer» Correct Answer - B::C Fluorspar when added to alumina and cryolite make the fused mixture very conducting and reduce the melting point of the mixture. |
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| 132. |
Roasting of sulphides gives the gas X as a byproduct . This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic , acts as a reducing agent and its acid has never been isolated. The gas X is :A. `SO_3`B. `H_(2)S`C. `SO_2`D. `CO_2` |
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Answer» Correct Answer - D Roasting of sulphide ores gives `SO_(2)` with choking smell of burnt sulphur. `SO_2+ H_(2)O rArr [H_(2)SO_(3)] ltimplies 2H^(+) + SO_(3)^(2-)` `SO_2` causes acid rain and damage respiratory system. |
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| 133. |
Out of the following matals that cannot be obtained by electrolysis of the aquenous solution of their salts isA. AgB. CrC. CuD. Mg |
| Answer» Correct Answer - D | |
| 134. |
Which metal cannot be obtained by electrolyte sis?A. CaB. MgC. CrD. Al |
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Answer» Correct Answer - B::C Chromium cannot be obtained by elctrolysis . |
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| 135. |
The ore having two different metal atoms isA. Copper pyritesB. haematiteC. MagnetiteD. Haematite |
| Answer» Correct Answer - A | |
| 136. |
Which is the strongest reducing agent ?A. RbB. NaC. KD. Mg |
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Answer» Correct Answer - A Strongest reducing agent is Rb. |
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| 137. |
What is the impure form of zinc commonly known as ? |
| Answer» Correct Answer - Zince spelter | |
| 138. |
The ore that is concentrated by froth floatation process isA. ZinciteB. CinnabarC. BauxiteD. Malachite |
| Answer» Correct Answer - B | |
| 139. |
The common method of extraction of metals from oxide ores isA. Reduction with carbonB. Reduction with hydrogenC. Reduction with aluminiumD. Electrolytic method. |
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Answer» Correct Answer - A The common method of extraction of metals from oxide ores is reduction with carbon .] |
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| 140. |
Cryolite isA. `Al_(2) O_(32)H_(2)O`B. `Na_(3)AlF_(6)`C. `Al(OH)_(4)O_(5)`D. `KAlSi_(3)O_(8)` |
| Answer» Correct Answer - B | |
| 141. |
The formula of kaolinite is _____________A. `AlSi(OH)_(7)`B. `Al_(2)(OH)SiO_(3)`C. `Al_(2)(I+OH)_(4)Si_(2)O_(5)`D. `Al(OH)_(3)SiO_(2)` |
| Answer» Correct Answer - C | |
| 142. |
Which of the following reactions show the process of smelting ?A. `2PbO+ PbS to 3Pb + SO_(2)`B. `2Na[Au)CN)_(2)]+Zn to Na_(2) [Zn(CN)_(4)]+2Au`C. `PbO + C to Pb + CO`D. `2HgS + 3O_(2) to 2HgO + 2SO_(2)` |
| Answer» Correct Answer - C | |
| 143. |
The phenomenon of removing layers of basic oxides from metals before electroplating is calledA. GalvanisingB. AnodisingC. PolingD. Pickling |
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Answer» Correct Answer - D Pickling is done by dipping the impure metal in dil.acid so as to remove the basic layer on it. |
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| 144. |
Iron is removed from cahalcopyrite asA. FeSB. `FeSiO_(3)`C. `FeO`D. `Fe_(2)O_(3)` |
| Answer» Correct Answer - B | |
| 145. |
Which of the following processes involves smelting ? |
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Answer» Correct Answer - B Smelting is reduction with carbon . |
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| 146. |
Name and formula of two magnetic ores. |
| Answer» `MnO_(2)` (Pyrolusite) and `Fe_(3)O_(4)`(Magnetite) | |
| 147. |
Which types of ores are purified by hydraulic washing ? Give two examples also. |
| Answer» Heavy ores like `Fe_(2)O_(3)`. Haematitie, `CuCO_(3)*Cu(OH)_(2)` Malachite. | |
| 148. |
Which of the following is correct ?A. Gangue + Flux = SlagB. Froth + Slag = GangueC. Gangue + Slag = FluxD. Flux + Slag = Gangue |
| Answer» Correct Answer - A | |
| 149. |
Use of electrolysis is .A. ElectroplatingB. Removal of electronsC. ElectrorefiningD. Both (a) and (c) |
| Answer» Correct Answer - D | |
| 150. |
Which one of the following alloys has low density but considerable strength ?A. BrassB. BronzeC. DuraluminD. Gun metal |
| Answer» Correct Answer - C | |