Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, i.e., matter in its various forms that contain carbon atoms.[1] Study of structure determines their structural formula. Study ...
CHEM 120 LATEST FINAL EXAM 2023- 2024 SESSION GRADED A+ ACCURATE EXAM WITH SOLUTIONS
CHEM 120/103 MODULES EXAM COLLECTION 2023 FINEST MOD 1-6 PRE PREDICTOR EXAM GUARANTEED PASS
Category CHEM 120 INTRODUCTION TO GENERAL, ORGANIC, AND BIOLOGICAL CHEMISTRY WITH LAB
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1.
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What is the difference betweenPminerals and ores?
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1 Metal cannot be easily separated Metal can be easily separated
2 All minerals are not ore All ore are minerals
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3 e.g Bauxite, China clay
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e.g Bauxite
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What are the various steps involved in extraction of pure metals from their ores?
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Concentration of the ore
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Extraction of the crude metal.
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Refining of the crude metal.
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What is Flux? What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?
Material or substance that is added to molten metals in order to bind with easily
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removable impurities.
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Limestone act as a Flux.
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4.
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Which type of ores can be concentrated by froth floatation method and Gravity separation?
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Give two examples for such ores.
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Gravity separation method – Oxide ores (e.g)Haematite( Fe2O3) , Tinstone (SnO2)
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5. Define Gangue
The non-metallic impurities, rocky materials and siliceous matter present in the
ores are called gangue.
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N Neett Eg : SiO2
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6.
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Define Slag
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Slag is a fusible chemical substance formed by the reaction of gangue with a flux.
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Flux + gangue slag ddaass
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7.
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Explain zone refining process with an example
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The principle is fractional crystallisation.
When an impure metal is melted and allowed to solidify, the impurities will prefer to
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remain in the molten region. ie; impurities are more soluble in the melt than in the
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In this process the impure metal is taken in the form of a rod. One end of the rod is
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heated using a mobile induction heater, melting the metal on that portion of the rod.
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When the heater is slowly moved to the other end pure metal crystallises while
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impurities will move on to the adjacent molten zone formed due to the movement of
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the heater.
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As the heater moves further away, the molten zone containing impurities also moves
along with it.
This process is repeated several times by moving the heater in the same direction
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again and again to achieve the desired purity level.
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NNe ett N Ne ett
lalai .i. This process is carried out in an inertlagas
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to prevent the oxidation of
metals.
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E.g Germanium, Silicon P and Gallium which are used as .
semiconductor
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Describe Mondw
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this process.
process 8.
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Mond process
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Ni + 4 CO Ni(CO)
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lalai.i. Ni(CO) Ni + 4 CO
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of Borax. 9.
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identification of coloured
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It is used as aw w
It actw w
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as preservative
Give the uses of silicones. 10.
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It is used for low temperature lubrication.
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It is used for making water proofing clothes.
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It is used as insulating material in electric motor
a l a
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In heavier post transition metals, the outer s-electrons (ns) have a tendency to remain
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inert and show reluctance to take part in the bonding . P
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12. Why fluorine always exhibit an oxidation state of -1?
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It is the most electronegative element.
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N Neett It can form hydrogen bonds
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Why fluorine is more reactive than other halogens?
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Small Size
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It is the most electronegative element. ddaa s
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Due to the minimum value of F-F bond dissociation energy
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What are interhalogen compounds? Give examples. w
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Each halogen combines with other halogen to from a series of compounds.
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E.g : Cl2 + F2 2ClF
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a .i. Used for filling air balloons.
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It has lowest boiling point hence used in cryogenics.
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He-O2 Misture is used by diver in place of air oxygen mixture.
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Give the uses of Neon.
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It is used in advertisement as neon sign and the brilliant red glow is caused by
passing electric current through neon gas under low pressure.
17. Give the uses of Argon.
prevents the oxidation of hot filament.
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lalai.i. prolongs the life in filament bulbs
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